Journal articles: 'Life stress assessment'

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Yasuda, Shigeru, Masahiro Takanashi, and Kenji Tokuda. "Fatigue life assessment using stress gradient factor." Proceedings of the Materials and Mechanics Conference 2019 (2019): OS0316. http://dx.doi.org/10.1299/jsmemm.2019.os0316.

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Kanbara, Kenji, and Yukihiro Morita. "Stress assessment by psychophysiological monitoring in daily life." Impact 2019, no. 8 (2019): 48–50. http://dx.doi.org/10.21820/23987073.2019.8.48.

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Stress is a natural phenomenon designed to serve as the body's natural survival reaction to real or perceived threats. It is a complex and multifaceted function and its purpose is to allow organisms to adapt quickly to a potentially dangerous situation, promoting an individual's likelihood of survival. Stress levels peak markedly in a 'fight or flight' incident, then reduce again after danger has passed. Stress is designed to work in an acute situation, but when the stress becomes chronic – as is often the case in many modern lifestyles–the body remains constantly on high alert, potentially causing a number of stress-related symptoms. While the exact mechanisms behind it are not clearly understood, stress is recognised as having a major impact on overall human health and wellbeing and, indeed, may directly or indirectly lead to illnesses such as organic or functional disorders, cancer and mental health conditions. Mental health issues and stress-related diseases are becoming ever-more prevalent as modern lifestyles become more pressured, particularly within sub-populations such as those who work in hospitals and in industry. However, the general population is also becoming increasingly affected by stress. Professor Kenji Kanbara, from the Department of Clinical Psychology, Faculty of Medicine at Kagawa University in Japan, is a medical doctor who has an extensive experience in understanding more about stress-related illnesses. 'Psychosomatic processes are subconsciously progressive, and the health threat is significant for that reason,' he highlights. Thus, it is important to be able to recognise and deal with increased stress levels to forestall further health issues.

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Kanbara, Kenji, and Yukihiro Morita. "Stress assessment by psychophysiological monitoring in daily life." Impact 2020, no. 7 (2020): 70–72. http://dx.doi.org/10.21820/23987073.2020.7.70.

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Stress is a natural phenomenon designed to serve as the body's natural survival reaction to real or perceived threats. It is a complex and multifaceted function and its purpose is to allow organisms to adapt quickly to a potentially dangerous situation, promoting an individual's likelihood of survival. Stress levels peak markedly in a 'fight or flight' incident, then reduce again after danger has passed. Stress is designed to work in an acute situation, but when the stress becomes chronic – as is often the case in many modern lifestyles – the body remains constantly on high alert, potentially causing a number of stress-related symptoms. While the exact mechanisms behind it are not clearly understood, stress is recognised as having a major impact on overall human health and wellbeing and, indeed, may directly or indirectly lead to illnesses such as organic or functional disorders, cancer and mental health conditions. Mental health issues and stress-related diseases are becoming ever-more prevalent as modern lifestyles become more pressured, particularly within sub-populations such as those who work in hospitals and in industry. However, the general population is also becoming increasingly affected by stress. Professor Kenji Kanbara, from the Department of Clinical Psychology, Faculty of Medicine at Kagawa University in Japan, is a medical doctor who has an extensive experience in understanding more about stress-related illnesses. 'Psychosomatic processes are subconsciously progressive, and the health threat is significant for that reason,' he highlights. Thus, it is important to be able to recognise and deal with increased stress levels to forestall further health issues.

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KHAN, FARHAT, MUHAMMAD BILAL AZMI, MEHWISH HUSSAIN, and Sarah Shamim Azmi. "ASSESSMENT OF JOB STRESS;." Professional Medical Journal 20, no. 01 (2018): 156–63. http://dx.doi.org/10.29309/tpmj/2013.20.01.582.

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ABSTRACT... Background: Today medical profession is fully equipped with highly competitive roles and responsibilities which serve ashigh source of stress in one’s daily life. Stress has it negative effects on person’s life like unbearable health outcomes are among one ofthe prominent cause of stress linked occupational diseases. Objective: The objective of this study was to determine the job stress amongdifferent doctors working in tertiary care hospitals of Karachi and to compare it with different demographical factors. Subjects andmethods: Non- experimental, cross-sectional survey was conducted at different tertiary care hospitals of Karachi. Total one hundred andthirty five doctors filled the standardized job stress questionnaire through convenient sampling method from December 2011 to April2012. Results: Overall job stress score was 52.56 ± 16.35. The value of Cronbach’s Alpha was 79.65%. Unmarried professionals weresignificantly more stressed than married professionals (p < 0.0001). Similarly, participants with only graduate degree with less year ofexperience were found to have higher stress than postgraduate medical doctors. The change in the marital status, depicted by Gammacoefficient, explained the decrement of job stress observed from single to married. Conclusions: It was concluded from this study that inmedical profession stress is never underestimated. Demographic factors like marital status, experience and professional qualificationserve as the stress reducing factors among professional.

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CUNHA, S. B., I. P. PASQUALINO, and B. C. PINHEIRO. "Stress-life fatigue assessment of pipelines with plain dents." Fatigue & Fracture of Engineering Materials & Structures 32, no. 12 (2009): 961–74. http://dx.doi.org/10.1111/j.1460-2695.2009.01396.x.

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Badara Camara, Aliou, Fabienne Pennec, Sébastien Durif, Jean-Louis Robert, and Abdelhamid Bouchaïr. "Fatigue life assessment of bolted connections." MATEC Web of Conferences 165 (2018): 10009. http://dx.doi.org/10.1051/matecconf/201816510009.

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The work presented in this paper deals with the fatigue damage assessment of bolted joints. The influence of the preload is particularly underlined as it is shown that it strongly improves the fatigue resistance of the bolt whatever the geometrical parameters are. A 3D tee-stub model with the bolt submitted to preload force is simulated by using the Salome-Meca FEM software. A parametric study is also carried out to analyse the influence of the bolt location m and the column flange thickness tf onto the bolt loading. In order to analyse the effect of the stress concentration generated by the head-shank transition of the screw, a second 3D finite bolt element model is developed. This allows to exhibit multiaxial stress states in the vicinity of the fillet radius. Finally, a multiaxial fatigue post-treatment tool has been implemented on Matlab software for damage assessment purpose. Two multiaxial fatigue criteria approaches contribute to this tool and may be used for fatigue behaviour prediction. The so-called critical plane approach (Dang Van criterion) and the integral approach (Zenner criterion) may consequently be compared for that analysis.

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Navarro, Carlos, Jesús Vázquez, and Jaime Domínguez. "Life Assessment in Fretting Fatigue." Key Engineering Materials 618 (July 2014): 99–122. http://dx.doi.org/10.4028/www.scientific.net/kem.618.99.

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Fretting fatigue denotes the detrimental effect on a material arising from the cyclic sliding of two contacting surfaces with small relative displacements between them. One or both of the components in contact may be subject to bulk stresses caused by cyclic loads. The assessment of the fretting fatigue strength and life of any component is a complicated issue due to the many parameters affecting it, the complexity of the stress fields cyclic variation during fretting and the uncertainties associated to the contact conditions. This paper describes some singular aspects of fretting fatigue related to strength analysis and testing, presents a procedure developed by the authors during the last years to estimate the fretting fatigue strength and life and compares the assessment outcomes with the results of tests carried out by different authors.

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Miller, Thomas W., Peter Kamenchenko, and Alexie Krasniasnski. "Assessment of Life Stress Events: the Etiology and Measurement of Traumatic Stress Disorder." International Journal of Social Psychiatry 38, no. 3 (1992): 215–27. http://dx.doi.org/10.1177/002076409203800305.

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Burger, Robert, and Yung-Li Lee. "Assessment of the Mean-Stress Sensitivity Factor Method in Stress-Life Fatigue Predictions." Journal of Testing and Evaluation 41, no. 2 (2013): 20120035. http://dx.doi.org/10.1520/jte20120035.

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Du, Wei Ming, and Fei Xue. "Fatigue Life Assessment of Crane Reel." Advanced Materials Research 383-390 (November 2011): 2941–44. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2941.

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The crane reel is generally manufactured by section welding method when the diameter is over 380mm. With the cumulative fatigue damage principle which is based on stress S-N curve, the fatigue damage of one crane reel is analyzed by finite element method, the reel weld fatigue strength and fatigue life are calculated, and the simulation results are proved to be reliable. This method provides an efficient reference for crane reel design and residual life estimation.

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Xu, Bin, Tao Zhang, Feng Qi Wu, and Zhen Rong Yan. "Fatigue Life Assessment of a Ship Unloader Crane." Advanced Materials Research 945-949 (June 2014): 1086–89. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.1086.

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Ship unloader crane was widely used in transportation, and uploaded or unloaded cargoes from ships, which could influence efficiency and benefits of transportation greatly. In order to improve the reliability and safety, and decrease its risk in working flow, a method of fatigue life assessment was proposed in this paper. According to related standards and properties of risk, finite element method and experimental stress analysis were integrated to assess the working condition of a ship unloader crane. Finite element models of primary structures subjected to loads were built to achieve dynamic properties, which could supply a basic reference to experiment and guidance to locate the tested positions. Afterwards, wireless dynamic resistance strain-gauges were adopted to execute static and dynamic stress, and the tested results combined with finite element analysis were applied to strength analysis. Based on nominal stress and Miner principle, rainflow method was developed to fatigue life assessment of this ship unloader crane. The final results indicated that residual life of this crane was 4.67 years.

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Xu, Bin, Xiao Ying Tang, Yu Jiang, and Wen Gong. "Fatigue Life Assessment of Steel Structures of a Metallurgy Crane." Applied Mechanics and Materials 713-715 (January 2015): 126–29. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.126.

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A fatigue life assessment method of steel structures was proposed in this study and applied in a metallurgy crane. Analytical method and experimental analysis were adopted to evaluate the static strength of steel structures, and then dynamic stress test was applied to get the stress history in a whole working cycle, which could determine the interest point and stress spectrum. Finally, rainflow method was applied to approach the stress spectrum, and then the fatigue life was predicted based on Miner rules. The results indicated that this method showed a potential application in practical engineering.

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Jung, Sung-Wook, Yoon-Suk Chang, Jae-Boons Choi, and Young-Jin Kim. "Stress Classification Using Artificial Neural Networks and Fatigue Life Assessment." Transactions of the Korean Society of Mechanical Engineers A 30, no. 5 (2006): 520–27. http://dx.doi.org/10.3795/ksme-a.2006.30.5.520.

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Flannery, Raymond B., and Dow Wieman. "Social support, life stress, and psychological distress: An empirical assessment." Journal of Clinical Psychology 45, no. 6 (1989): 867–72. http://dx.doi.org/10.1002/1097-4679(198911)45:6<867::aid-jclp2270450606>3.0.co;2-i.

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Pop-Jordanova, Nada, and Jordan Pop-Jordanov. "Electrodermal Activity and Stress Assessment." PRILOZI 41, no. 2 (2020): 5–15. http://dx.doi.org/10.2478/prilozi-2020-0028.

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AbstractStress, as a kind of emotion, is inevitable in everyday life. In psychosomatic medicine stress represents a powerful link in the pathophysiological chain of disorder. Having evidence about the power of stress on the body, the interest in medicine was how to measure it in appropriate, fast way and with minimal cost. Electrodermal activity seems to be available for this purpose.The galvanic skin response (GSR) is an objective, transient indication of autonomic nervous system arousal in response to a stimulus. It refers to changes in sweat gland activity that are reflective of the intensity of our emotional arousal.In this article we discuss physiological specifics of skin conductance/resistance and how it is measured in practice. The most used application of GSR is in biofeedback methodology. Biofeedback assessment and training exactly uses skin reaction to different stimuli and aims to gain voluntary control over this autonomic response. The aim of this article is to show effectiveness of this method in paediatric practice.

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Lisowski, Filip, and Edward Lisowski. "Testing and Fatigue Life Assessment of Timber Truck Stanchions." Applied Sciences 10, no. 17 (2020): 6134. http://dx.doi.org/10.3390/app10176134.

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Components of transport trucks are subjected to dynamic cyclic loads. The magnitude of these loads depends on road conditions and cargo mass. Cyclic loads can cause fatigue failure at stress levels significantly below the yield strength of the material. When calculating fatigue, it is necessary to determine the actual loads acting on the structure under working conditions. In this study, stanchion displacements of overloaded timber trucks were measured under both static and dynamic loads. For the specified mass of timber, a history of dynamic loads acting on the stanchion was obtained. Then, based on the finite element analysis, stress concentration points were determined within the base material and welded joints of the stanchion. The history of maximum stresses at concentration points was determined. Stress ranges and mean stresses for the load history were calculated using the rainflow fatigue cycle counting method. Repeats to failure were determined on the basis of the Palmgren–Miner cumulative damage rule and the modified Goodman correction for the points with the highest stress level. Experimental investigation of the actual load history of the stanchion of significantly overloaded timber truck allowed to determine the mileage to potential failure.

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Ibrahim, R. A. "Overview of Structural Life Assessment and Reliability, Part II: Fatigue Life and Reliability Assessment of Naval Ship Structures." Journal of Ship Production and Design 31, no. 02 (2015): 100–128. http://dx.doi.org/10.5957/jspd.2015.31.2.100.

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Structural life assessment periodically evaluates the state and condition of a structural system and provides recommendations for possible maintenance actions or the end of structural service life. It is a diversified field and relies on the theories of fracture mechanics, fatigue damage process, probability of failure, and reliability. With reference to naval ship structures, their life assessment is not only governed by the theory of fracture mechanics and fatigue damage process, but by other factors such as corrosion, grounding, and sudden collision. The purpose of this series of review articles is to provide different issues pertaining to structural life assessment of ships and ocean structures. Part I deals with the basic ingredients of the theory of fracture mechanics, which is classified into linear elastic fracture mechanics and elasto-plastic fracture mechanics. The amount of energy available for fracture is usually governed by the stress field around the crack, which is measured by the stress intensity factor. The value of the stress intensity factor, which depends on the loading mode, is evaluated by different methods developed by many researchers. The applications of the theory of fracture mechanics to metallic and composite structures are presented with an emphasis to those used in marine structures. When the inertia of relatively large pieces of a structure is large enough that the correct balancing of the energy of fracture requires the inclusion of kinetic energy, then the dynamic nature of fracture dominates the analysis. For a crack that is already propagating, the inertial effects are important when the crack tip speed is small compared with the stress wave velocities. This fact has been realized in the theory of fracture mechanics under the name of dynamic fracture and peridynamic. In essence, peridynamic replaces the partial differential equations of classic continuum theories with integro-differential equations as a tool to avoid singularities arising from the fact that partial derivatives do not exist on crack surfaces and other singularities. A brief overview of fracture dynamics and peridynamics together with damage mechanisms in composite structures is presented. The limitations of fracture mechanics criteria are also discussed. Life assessment of ship structures depends on the failure modes and the probabilistic description of failure, which are addressed in Part II. Life assessment of ship structures depends on the failure modes and the probabilistic description of failure. In view of structural parameter uncertainties, probabilistic analysis requires the use of reliability methods for assessing fatigue life by considering the crack propagation process and the first passage problem, which measures the probability of the exit time from a safe operating regime. The main results reported in the literature pertaining to ship structural damage assessments resulting from to slamming loads, liquid sloshing impact loads of liquefied natural gas in ship tankers, and ship grounding accidents, and collision with solid bodies are discussed in Part III. Under such extreme loadings, structural reliability will be the major issue in the design stage of ocean structures. The treatment of extreme loading on ship structures significantly differs from those approaches developed by dynamicists. Environmental effects on ship structures play a major factor in the life assessment of ocean systems. In particular, these effects include corrosion and hydrogen embrittlement. Part IV is devoted to a ship's life assessment resulting from corrosion and hydrogen embrittlement. Because structural components made from aluminum and its alloys are vital to the ship and aerospace industries, the influence of environment on aluminum structures and the means of corrosion control and monitoring in both aluminum and nonaluminum metals are presented. Hybrid ships consist of a stainless steel advanced double-hull center section, to which a composite material bow and/or stern is attached. Such structures require strong joints between the composite and the steel parts. Some of the difficulties with joining composites and metal are related to the large difference in mechanical properties such as stiffness, coefficient of thermal expansion, etc., between the adherents and the large anisotropy of composites. Such differences generally lead to large stress concentrations and weak joints. Fatigue crack growth, stress concentrations resulting from details, joints, and fasteners are addressed in Part V. Fatigue improvement in welded joints is considered one the major tasks of this part. Brittle fracture of hull structures causes serious structural damage and this motivated the ship structure community to develop some means to prevent brittle cracks from occurring. The basic principle behind the use of a crack arrester is to reduce the crack-driving force below the resisting force that must be overcome to extend a crack. The crack arrestor can be as simple as a thickened region of metal or may be constructed of a laminated or woven material that can withstand deformation without failure. Part VI provides different approaches of passive crack control in the form of crack arresters to stop crack propagation before it spreads over a structure component. Crack arresters used in ship structures and pipelines are described for both metal and composite materials. This six-part review article is by no means exhaustive and is based on over 1800 references. It does not address the structural health monitoring, which constitutes a major task in the structural diagnostic process.

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Beachkofski, Brian K. "Probabilistic Rotor Life Assessment Using Reduced Order Models." Shock and Vibration 16, no. 6 (2009): 581–91. http://dx.doi.org/10.1155/2009/717059.

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Probabilistic failure assessments for integrally bladed disks are system reliability problems where a failure in at least one blade constitutes a rotor system failure. Turbine engine fan and compressor blade life is dominated by High Cycle Fatigue (HCF) initiated either by pure HCF or Foreign Object Damage (FOD). To date performing an HCF life assessment for the entire rotor system has been too costly in analysis time to be practical. Although the substantial run-time has previously precluded a full-rotor probabilistic analysis, reduced order models make this process tractable as demonstrated in this work. The system model includes frequency prediction, modal stress variation, mistuning amplification, FOD effect, and random material capability. The model has many random variables which are most easily handled through simple random sampling.

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Jang, Jaeik, Juhee Lim, and Jongsoo Lee. "Durability Assessment of CFRP Lower Control Arm Using Stress-Life Method." Transactions of the Korean Society of Mechanical Engineers - A 41, no. 11 (2017): 1131–37. http://dx.doi.org/10.3795/ksme-a.2017.41.11.1131.

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Kang, Dae-Hung, Changhwan Jang, Yeon-Soo Park, Suk-Yeol Han, and Jin Ho Kim. "Fatigue Reliability Assessment of Steel Member Using Probabilistic Stress-Life Method." Advances in Mechanical Engineering 4 (January 2012): 649215. http://dx.doi.org/10.1155/2012/649215.

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DUGGAL, SUNITA, SUSAN MALKOFF-SCHWARTZ, BORIS BIRMAHER, et al. "Assessment of Life Stress in Adolescents: Self-Report Versus Interview Methods." Journal of the American Academy of Child & Adolescent Psychiatry 39, no. 4 (2000): 445–52. http://dx.doi.org/10.1097/00004583-200004000-00013.

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Singh, Raghubir. "Remaining life assessment of high temperature components using threshold stress concept." Sadhana 20, no. 1 (1995): 87–101. http://dx.doi.org/10.1007/bf02747285.

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Jiang, Xu, Yuan Yuan, Chong Wu, and Chengwei Luo. "Fatigue Life Assessment of Orthotropic Steel Deck with UHPC Pavement." Journal of Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/8413607.

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In recent years, a number of large-span bridges with orthotropic steel decks were constructed in China. With increasing traffic volumes and higher wheel loads, many fatigue cracks developed at the welds and the edge of cut-out holes. This paper aims at presenting the numerical analysis on the fatigue performance of the orthotropic steel deck using ultrahigh performance concrete (UHPC) overlay as the deck pavement instead of the conventional asphalt concrete pavement. By using finite element method (FEM) model, stress distribution at fatigue sensitive locations under the action of wheel loads is characterized and the obtained stress ranges indicate that the UHPC pavement significantly reduces the magnitude of the stress peak valued. A suggested truck stream model based on the weigh-in-motion (WIM) data of four bridges in China is employed to calculate the stress variation at specific fatigue details. Furthermore, the fatigue damage accumulation at fatigue details under the UHPC and conventional asphalt concrete pavement is studied based on Miner’s linear cumulative damage rule and the rain-flow method. The results indicate that the UHPC pavement on the orthotropic steel deck can extend the service lives of the concerned regions over 100 years, but the fatigue lives will reduce significantly when the elastic modulus of UHPC decreases to 50% of the original value.

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CHOI, WOOSUNG, and JUNGSEOB HYUN. "A LIFE ASSESSMENT FOR STEAM TURBINE CASING USING INELASTIC ANALYSIS." Modern Physics Letters B 22, no. 11 (2008): 1141–46. http://dx.doi.org/10.1142/s0217984908015978.

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An important characteristic of a fossil power plant is its ability to maintain reliability and safety of the plant against frequent start-ups and load changes. Unstable states arising during start-ups, shutdowns and load changes give rise to unsteady temperature distribution with time in steam turbine innercasing (HP/IP), which results in non-uniform strain and stress distribution. The rapid increase of temperature during starts-ups, especially, causes susceptible to failure and reduction of expected life for steam turbine components. Thus accurate knowledge of thermal stresses is required for the integrity and lifetime assessment for the turbine components. In this paper, the fatigue damage is calculated of steam turbine inner casing was calculated by combining the stress analysis based procedure and Neuber's rule. By substituting the material cyclic stress-strain relationship into the Neuber equation, the inelastic total strain range was obtained. Using this study, life consumption of steam turbine inner-casing can be obtained and a guideline for effective maintenance was proposed.

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Chang, Yoon Suk, Shin Beom Choi, Young Jae Park, et al. "Stress Classification and Fatigue Life Assessment of Modular Component with Asymmetric Perforated Parts." Advanced Materials Research 33-37 (March 2008): 139–44. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.139.

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In the ASME Code Section III ‘design by analysis’ approach, stresses are determined by numerical method and compared with corresponding stress limits. This approach provides several stress criteria for fatigue life assessment and procedures for categorizing the representative stress components. Since the stress criteria were derived from two-dimensional basis, however, it may inappropriate to delineate structural components with complex geometry. In this paper, detailed transient analyses are performed for modular pressurizer with an asymmetric geometry, which includes perforated parts to mount various piping and equipments. Also, the applicability of an effective elastic modulus to consider the perforation and the appropriateness of stress linearization method using stress classification line are assessed. Then, the cumulative usage factor as well as stress intensities at critical locations of the pressurizer are calculated and compared with corresponding allowable design stress limits. The key findings of this work can be used to make regulatory guides for evaluation and confirmation of structural intensity of components with asymmetric perforated parts.

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Lee, Tak Kee, Chae Whan Rim, Seung Ho Han, and Jong Han Lee. "Automated Fatigue Life Assessment for Welded Cruciform Joint Considering Welding Residual Stress." Key Engineering Materials 297-300 (November 2005): 2800–2805. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2800.

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For a rational design of a welded joint, it is necessary to repeatedly assess the fatigue life of the joint with various dimensions and welding conditions. In this paper, an automated, repeatable/repetitive fatigue life assessment process for a welded cruciform joint was studied. The process consists of a structural analysis to obtain the stress distribution in the vicinity of the weldtoe, a thermal elasto-plastic analysis to determine the welding residual stress, and a fatigue life assessment based on the analyzed stress distribution and welding residual stress. With changes in design conditions including dimensions and/or welding heat input, the aforementioned tasks have to be performed. Using a commercial tool for system integration, automation of a repeated process for a welded cruciform joint based on 2D modeling was achieved. In this automated system, data exchanges between programs, regardless of whether they are commercial or in-house, work well, and parametric studies for optimal design can be performed.

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Ma, Xiqiang, Fang Yang, Jishun Li, Yujun Xue, and Zhiqiang Guan. "Fatigue life assessment method of in-service mechanical structure." Advances in Mechanical Engineering 13, no. 2 (2021): 168781402199652. http://dx.doi.org/10.1177/1687814021996524.

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The most usual failure mode of any mechanical structure is fatigue, which is characterized by an important feature of the decrease of elastic modulus of the material. In this paper, a fatigue life evaluation model based on equivalent elastic modulus is proposed for in-service mechanical structure. In the proposed model, parameters that represent the operating conditions of the mechanical structure, such as load, vibration, and shaft torque, etc., are used as the generalized load. To replace the fatigue stress, the statistical method is used here, which is also used in the conventional fatigue analysis method. The structural strain is also measured simultaneously. Using the statistical theory, the equivalent modulus of elasticity is formulated based on the relationship of stress, strain, and modulus of elasticity. To validate the proposed model, an online fatigue damage experiment has been conducted. The experimental results have been compared with that of the fatigue life prediction model with good agreement. It is expected that the methodology proposed in this paper will be widely used.

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Vosynek, Petr, Miloš Vlk, and Tomas Návrat. "Review of Pressurized Vessel Structural Design – An Assessment of Total Life." Applied Mechanics and Materials 624 (August 2014): 218–22. http://dx.doi.org/10.4028/www.scientific.net/amm.624.218.

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The paper discusses life prediction of pressurized cylindrical container because of its dangerous failure during usage. The fatigue of material and crack propagation were obvious from the fracture surface. Crack initiation was located in the notch root of the thread. Our goal was to review the vessel structural design based on its technical documentation.Two approaches for estimating the crack initiation period were used. As input parameters, stress-strain relations in the notch were obtained from FEM analysis, done in ANSYS Workbench. The first approach makes use of Neuber’s rule based on elastic-plastic shakedown and cyclic stress-strain curve. The second concept (which is described in ČSN EN 13445-3 or AD 2000 Mekblatt S2 respectively) uses elastic shakedown. Included stress-life curves leads to the number of cycles to crack initiation.Finally the subcritical crack growth period and final fracture were estimated = the total life was evaluated.

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Schlotz, Wolff, and Daniel J. H. Powell. "Ambulatory Assessment in Neuropsychology." Zeitschrift für Neuropsychologie 25, no. 4 (2014): 239–51. http://dx.doi.org/10.1024/1016-264x/a000140.

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Neuropsychological disorders involve a variety of symptoms that often lead to substantial functional impairments in daily life. Research, assessment, and treatment should include a reference to daily life, considering symptoms, personality, and life circumstances of the individual patient. Ambulatory assessment methodology provides progress by avoiding retrospective memory-based bias, increasing ecological validity, and by generating individual time series that permit idiographic analysis. Using multiple sclerosis as an example, we illustrate new findings generated by ambulatory assessment studies in the areas of fatigue, stress and cognitive functions, and we demonstrate future opportunities presented by ambulatory assessment methodology to research and clinical practice with multiple sclerosis patients.

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Wei, Tao, Sijin Zhao, Zongzhan Gao, Ke Zhang, Wenxuan Gou, and Yangfan Dang. "Residual life assessment method for polymethyl methacrylate." Multidiscipline Modeling in Materials and Structures 16, no. 4 (2020): 679–87. http://dx.doi.org/10.1108/mmms-07-2019-0126.

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PurposeFatigue and creep are the key factors for the failure of polymethyl methacrylate (PMMA) in the engineering structure, so a great of quantity attention is focused on the life prediction under the creep and fatigue conditions. This paper aims to mainly summarize the traditional life assessment method (S–N curve), life assessment method based on crazing density and life assessment method based on transmittance. S–N curve and classical creep curve are introduced on the traditional life assessment method; the variation of the craze density with the logarithm of cyclic numbers is given in different fatigue load. A linear relationship is obtained, and a higher stress leads to a higher slope, suggesting a faster growth of craze. Furthermore, a craze density model is purposed to describe this relationship; the variation of craze density with the time at different creep load is given. The craze density has two obvious stages. At the first stage, craze density ranged from approximately 0.02 to 0.17, and a linear relationship is obtained. In the following stage, a nonlinear relationship appears till specimen rupture, a new creep life model is proposed to depict two stages. The relationship between transmission and time under creep load is shown. With increasing of time, the transmittance shows a nonlinear decrease. Through polynomial nonlinear fitting, a relationship between the transmittance and residual life can be obtained. To provide reference for the life assessment of transparent materials, the paper compares three life assessment methods of PMMA.Design/methodology/approachThis paper uses the traditional life assessment method (S–N curve), life assessment method based on crazing density, life assessment method based on transmittance.FindingsThe variation of the craze density with the logarithm of cyclic numbers is given in different fatigue loads. A linear relationship is obtained, and a higher stress leads to a higher slope, suggesting a faster growth of craze. Furthermore, a craze density model is proposed to describe this relationship, and the variation of craze density with the time at different creep loads is given. The craze density has two obvious stages. The relationship between transmission and time under creep load is shown. With increasing of time, the transmittance shows a nonlinear decrease. Through polynomial nonlinear fitting, a relationship between the transmittance and residual life can be obtained.Originality/valueFatigue and creep are the key factors for the failure of PMMA in the engineering structure, so a great of quantity attention is focused on the life prediction under the conditions of creep and fatigue. This paper mainly summarizes traditional life assessment method (S–N curve), life assessment method based on crazing density and life assessment method based on transmittance.

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Petinov, S., and R. Guchinsky. "Stress-life criteria for fatigue assessment of struc-tures: problems of implementation." Transactions of the Krylov State Research Centre 2, S-I (2018): 96–103. http://dx.doi.org/10.24937/2542-2324-2018-2-s-i-96-103.

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Niesłony, Adam, and Michał Böhm. "Mean Stress Effect Correction in Frequency-domain Methods for Fatigue Life Assessment." Procedia Engineering 101 (2015): 347–54. http://dx.doi.org/10.1016/j.proeng.2015.02.042.

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Dise-Lewis, J. E. "The life events and coping inventory: an assessment of stress in children." Psychosomatic Medicine 50, no. 5 (1988): 484–99. http://dx.doi.org/10.1097/00006842-198809000-00005.

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Laterza, Michelangelo, Michele D’amato, and Vito Michele Casamassima. "Stress-Life Curves Method for Fatigue Assessment of Ancient Brick Arch Bridges." International Journal of Architectural Heritage 11, no. 6 (2017): 843–58. http://dx.doi.org/10.1080/15583058.2017.1315621.

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SHIGEYAMA, Haruhisa, Yukio TAKAHASHI, and Jonathan PARKER. "Creep Life Assessment of Grade 92 Steel under Multi-Axial Stress States." Proceedings of the Materials and Mechanics Conference 2016 (2016): OS10–05. http://dx.doi.org/10.1299/jsmemm.2016.os10-05.

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Choi, Woosung, Kazunari Fujiyama, Bumshin Kim, and Geewook Song. "Development of thermal stress concentration factors for life assessment of turbine casings." International Journal of Pressure Vessels and Piping 98 (October 2012): 1–7. http://dx.doi.org/10.1016/j.ijpvp.2012.07.001.

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Edwards, Lyndon, Mike C. Smith, Mark Turski, Michael E. Fitzpatrick, and P. John Bouchard. "Advances in Residual Stress Modeling and Measurement for the Structural Integrity Assessment of Welded Thermal Power Plant." Advanced Materials Research 41-42 (April 2008): 391–400. http://dx.doi.org/10.4028/www.scientific.net/amr.41-42.391.

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The safe operation of both thermal and nuclear power plant is increasingly dependent upon structural integrity assessment of pressure vessels and piping. Furthermore, structural failures most commonly occur at welds so the accurate design and remnant life assessment of welded plant is critical. The residual stress distribution assumed in defect assessments often has a deciding influence on the analysis outcome, and in the absence of accurate and reliable knowledge of the weld residual stresses, the design codes and procedures use assumptions that yield very conservative assessments that can severely limit the economic life of some plant. However, recent advances in both the modeling and measurement of residual stresses in welded structures and components open up the possibility of characterising weld residual stresses in operating plant using state-of–the–art fully validated Finite Element simulations. This paper describes research undertaken to predict residual stresses in stainless steel welds in order to provide validated reliable, accurate Structural Integrity assessment of nuclear power plant components

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CHANG, SUNGHO, GEEWOOK SONG, BUMSHIN KIM, JUNGSEB HYUN, and JEONGSOO HA. "THE LIFE ASSESSMENT OF STEAM TURBINE ROTORS FOR FOSSIL POWER PLANTS." International Journal of Modern Physics B 20, no. 25n27 (2006): 4371–76. http://dx.doi.org/10.1142/s0217979206041379.

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The operational mode of thermal power plants has been changed from base load to duty cycle. From the changeover, fossil power plants cannot avoid frequent thermal transient states, for example, start up and stop, which results in thermal fatigue damage at the heavy section components. The rotor is the highest capital cost component in a steam turbine and requires long outage for replacing with a new one. For an optimized power plant operational life, inspection management of the rotor is necessary. It is known in general that the start-up and shutdown operations greatly affect the steam turbine life. The start-up operational condition is especially severe because of the rapid temperature and rotational speed increase, which causes damage and reduction of life of the main components life of the steam turbine. The start-up stress of a rotor which is directly related to life is composed of thermal and rotational stresses. The thermal stress is due to the variation of steam flow temperature and rotational stress is due to the rotational speed of the turbine. In this paper, the analysis method for the start-up stress of a rotor is proposed, which considers simultaneously temperature and rotational speed transition, and includes a case study regarding a 500MW fossil power plant steam turbine rotor. Also, the method of quantitative damage estimation for fatigue-creep damage to operational conditions, is described. The method can be applied to find weak points for fatigue-creep damage. Using the method, total life consumption can be obtained, and can be also be used for determining future operational modes and life extension of old fossil power units.

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Ye, X. W., Y. H. Su, T. Jin, B. Chen, and J. P. Han. "Master S-N Curve-Based Fatigue Life Assessment of Steel Bridges Using Finite Element Model and Field Monitoring Data." International Journal of Structural Stability and Dynamics 19, no. 01 (2018): 1940013. http://dx.doi.org/10.1142/s0219455419400133.

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The accuracy of fatigue life assessment for the welded joint in a steel bridge is largely dependent on an appropriate [Formula: see text]-[Formula: see text] curve. In this paper, a master [Formula: see text]-[Formula: see text] curve-based fatigue life assessment approach for the welded joint with an open-rib in orthotropic steel bridge deck is proposed based on the finite element model (FEM) and field monitoring data from structural health monitoring (SHM) system. The case studies on fatigue life assessment by use of finite element analysis (FEA) for constant-amplitude cyclic loading mode and field monitoring data under variable-amplitude cyclic loading mode are addressed. In the case of FEA, the distribution of structural stress at fatigue-prone weld toe is achieved using 4-node shell element model and then transformed into equivalent structural stress by fracture mechanics theory. The fatigue life of the welded joint is estimated with a single master [Formula: see text]-[Formula: see text] curve in the form of equivalent structural stress range versus the cycles to failure. In the case of monitoring data-based fatigue life assessment, the daily history of structural stress at diaphragm to U-rib is derived from the raw strain data measured by the instrumented fiber Bragg grating (FBG) sensors and transformed into equivalent structural stress. The fatigue life of the investigated welded joint is calculated by cyclic counting method and Palmgren–Miner linear damage cumulative rule. The master [Formula: see text]-[Formula: see text] curve method provides an effective fatigue life assessment process, especially when the nominal stress is hard to be defined. A single master [Formula: see text]-[Formula: see text] curve will facilitate to solve the difficulty in choosing a proper [Formula: see text]-[Formula: see text] curve which is required in the traditional fatigue life assessment methods.

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Xie, Zhi Gang, and Xiao Qin Chen. "A Review of Thermal Stress Analysis and Fatigue Life Assessment on Boiler Drum." Advanced Materials Research 753-755 (August 2013): 2655–58. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.2655.

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By analyzing the structural thermal load mechanism of boiler drum, several temperature field models were analyzed and compared; thermal stress calculation method and its impact on the overall stress field were studied. Finally, according to the domestic and several foreign fatigue life assessment standards, the fatigue life prediction modes of boiler drum were discussed. Based on fatigue curve interpolation and the Miner fatigue linear accumulated damage theory of safety guidelines, the life loss results of initiating low-cycle fatigue crack can be calculated. Both ASME code and GB/T9222-2008 standard are suitable to fatigue life assessment for boiler drum, due to the reasonable basis and reliable results.

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Petinov, Sergei, and Ruslan Guchinsky. "Criteria for Fatigue Failure of Materials: Application in Fatigue Assessment of Structures." Advanced Engineering Forum 26 (February 2018): 1–8. http://dx.doi.org/10.4028/www.scientific.net/aef.26.1.

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Presently in rules for fatigue assessment of structures subjected to intensive alternating service loading the Stress-Life (S-N) criteria are recommended in versions of the Nominal stress approach, Hot-spot stress and Notch-stress approach based on using the stress range a representative of the current damage. The criteria and approaches provide assessment of fatigue properties of structures accompanied with a series of approximations and uncertainties. A physically and mechanically more correct procedures might be provided by the Strain-life and Inelastic strain energy criteria for fatigue failure and approaches, although specific with intrinsic sources of approximations. The nature of approximations in the approaches is briefly commented and feasible means of improvement the fatigue assessment procedures and applications are presented.

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Bertini, Leonardo, Francesco Frendo, and Giuseppe Marulo. "Fatigue life assessment of welded joints by two local stress approaches: The notch stress approach and the peak stress method." International Journal of Fatigue 110 (May 2018): 246–53. http://dx.doi.org/10.1016/j.ijfatigue.2018.01.024.

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Loeffler, Simone N., Juergen Hennig, and Martin Peper. "Psychophysiological Assessment of Social Stress in Natural and Laboratory Situations." Journal of Psychophysiology 31, no. 2 (2017): 67–77. http://dx.doi.org/10.1027/0269-8803/a000170.

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Abstract. Experience sampling and psychophysiological ambulant assessment methods were employed to compare reactions to social stress using a laboratory stressor (The Trier Social Stress Test [TSST]) or a corresponding real-life condition (seminar presentation). Stress reactions were assessed by self-report as well as additional heart rate (AHR, i.e., heart rate increases corrected for physical activity and initial values) and were compared to a control condition in each group. Twenty-five participants gave a talk in a university seminar course and twenty-two participants took part in the TSST. The TSST elicited a greater overall physiological stress reaction as compared to the seminar presentation. However, analyses of dynamic AHR levels revealed that the groups of speakers showed different response profiles during the time course of the stress situations. AHR levels of both groups were similar at the beginning of the free speech. During the course of their presentation, seminar speakers downregulated their arousal level. The arousal level of TSST participants showed a further increase in the later portion of the TSST during the mental arithmetic task. Thus, the more prominent overall physiological stress reaction during the TSST as compared to the seminar presentation appeared to depend on different demand characteristics rather than on differences of laboratory versus real-life situations per se. The experience of emotional strain was greater in response to the social stressors than in response to control situations in both the TSST and seminar speaker group with no differential effects of the experimental setting (laboratory vs. real life). During the TSST procedure, salivary cortisol concentrations were also assessed. Significant correlations of AHR with cortisol level and subjective experience indicate that AHR measurement provides a valid psychophysiological indicator of social stress. These findings suggest that ambulatory assessment techniques successfully contribute to the validation of a common social stress task.

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Mazilauskaite, Ruta. "Importance of Gymnasium Students’ Anxiety, Identity Style and Stress Coping Strategies for Examination Stress Assessment." Jaunųjų mokslininkų darbai 51, no. 1 (2021): 21–30. http://dx.doi.org/10.15388/jmd.2021.2.

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Examinations and their results often become perhaps the biggest challenge in young person’s life, which is associated with the course of later life. For this reason, a high level of stress is observed, which is maintained by both personal and situational factors. In this context, the objective of this study is to identify the links between the experienced anxiety, identity style, examinations stress and its coping strategies of the gymnasium students. The study involved 175 gymnasium students in grades 10 to 12. Of these, 109 were girls (62.3%) and 66 were boys (37.7%), aged 16 to 19 years of age (M = 17.27, SD = 0.92). Gymnasium students were given a questionnaire based on the State-Trait Anxiety Inventory (Spielberger, Gorsuch, Lushene, 1970), Identity Style Inventory Version 5 (ISI-5) (Berzonsky, Soenens, Luyckx, Smits, Papini, Goossens, 2013), the Stress Coping Questionnaire (Grakauskas, Valickas, 2006), and the Examination Stress Scale for Adolescent Students (Sung, Chao, 2014). It was found that the more frequent experience of stress in gymnasium students examinations was predicted by stronger trait and state anxiety, more frequent choice of informational, normative identity processing style and more frequent use of avoidance strategy in experiencing stress.

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Malcolm, James P. "Assessment of Life Stress in Gay and Bisexual Men with the Gay Affect and Life Events Scale." Journal of Homosexuality 42, no. 4 (2002): 135–44. http://dx.doi.org/10.1300/j082v42n04_09.

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Lan, Cheng Ming, and Hui Li. "Fatigue Properties Assessment of Corroded Cable." Key Engineering Materials 413-414 (June 2009): 757–64. http://dx.doi.org/10.4028/www.scientific.net/kem.413-414.757.

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Based on fatigue test results of corroded wires obtained from dissection of actual parallel wire cables which were used on a certain domestic cable-stayed bridge, the fatigue properties of corroded parallel wire cable are investigated by the method of Monte Carlo simulation in this paper. The results of fatigue life and corrosion degree of corroded wire are presented. Comparisons between the original design information and fatigue test results, it can be seen that corrosions make the fatigue lives of wires decreasing sharply. The fatigue life of individual wire is described by Weibull distribution considered some useful parameters such as, stress range, mean stress, mean static strength and length effects. The effects of percentage of broken wire, cable S-N curve parameter on cable fatigue life are discussed. It can be seen that the cable fatigue lives are controlled by a small fraction of the cable wires with the shortest fatigue lives. Finally, the S-N curves of cable are calculated by Monte Carlo simulations based on the results of individual wire fatigue test, and compared with the results of cable fatigue test.

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Choudhury, Jyotirmayee. "Occupational Stress, Physical Wellness and Productivity Barometer at Workplace." International Journal of Advances in Management and Economics 8, no. 5 (2019): 46–50. http://dx.doi.org/10.31270/ijame/v08/i05/2019/6.

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The paper is a conceptual one to understand the relationship between occupational stress, physical wellbeing and productivity barometer such as burnout, illness, labour turnover and absenteeism. The accumulated unpleasant emotional and psychological feelings ascend out of occupational stress impacts the physical and mental wellness of an employee which ultimately depreciates his/ her productivity barometer. The present paper is a conceptual frame work to understand the concept stress, occupational stress and individual’s appraisal of it in his/her work environment. The research work analyses occupational stress as more of a sort of individual generated which rises out of individual’s assessment of the stressors of work life. The objective of the research work is to study on occupational stress, physical and psychological wellbeing and productivity barometer. The research article attempts to suggest in promoting health philosophy and physical wellness programme in organisation’s work culture and environment through individual initiated interventions and organisation policy to put a control on occupational stress in order to check the alarming signal of productivity barometer. Keywords: Occupational Stress, Physical Wellbeing, Productivity Barometer, Quality of Work Life and Quality of Life.

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Cameron, Michael J., Russell W. Maguire, and Jennifer McCormack. "Stress-Induced Binge Eating: A Behavior Analytic Approach to Assessment and Intervention." Journal of Adult Development 18, no. 2 (2011): 81–84. http://dx.doi.org/10.1007/s10804-010-9112-9.

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Lewinsohn, Peter M., Paul Rohde, and Jeffrey M. Gau. "Comparability of Self-Report Checklist and Interview Data in the Assessment of Stressful Life Events in Young Adults." Psychological Reports 93, no. 2 (2003): 459–71. http://dx.doi.org/10.2466/pr0.2003.93.2.459.

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The purpose of this study was to evaluate the incremental value of conducting an interview to assess stressful life events over the self-report questionnaire approach, first by examining the degree to which life events reported on a questionnaire met inclusion criteria in a detailed stress interview, and second, by comparing the magnitude of prospective associations with depression symptoms for the two different assessment procedures. Data from the Oregon Adolescent Depression Project were examined, in which 191 community-residing young adults (55% female; M age = 23.6, SD = 0.6) completed a mailed questionnaire assessing the frequency with which 33 life events had occurred to them or to other important people in their lives prior to the diagnostic and stress interviews. An average of 67.5% of events occurring to self met criteria for classification as a life event on the stress interview, as did 19.7% of the events occurring to others. Events having a large effect on the participant had a greater likelihood of meeting inclusion criteria on the stress interview. Contrary to expectation, stress scores from the interview assessment did not result in stronger associations with depression. Recommendations for assessment of stressful life events are offered.

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Song, Ming, Weiya Zhang, Wenchun Jiang, Jinguang Wang, Xu Zhao, and Xiangnan Zhai. "Fatigue Life Assessment of the Shell Structure of Purified Terephthalic Acid Filter Press." Materials 13, no. 15 (2020): 3276. http://dx.doi.org/10.3390/ma13153276.

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The filter press is one of the most important devices in purified terephthalic acid (PTA) refinement, and it is of great significance to ensure the fatigue strength of the structure in operation. In this study, the fatigue life prediction of the shell structure of the PTA filter press was investigated through numerical and experimental methods. Firstly, the accurate stress at the critical area of the stiffener was obtained based on the thermomechanical model and submodel approach proposed. Subsequently, the fatigue life was evaluated by the fatigue strength reduction method and hot spot stress method. Finally, the shell structure is optimized by increasing the size of the axial stiffener and continuous hoop stiffener. The results unveil that both thermal load and outer structure constraints have little effect on the radial displacement and stress amplitude of the shell structure. Through modifying the fatigue design curve of the fatigue strength reduction method, the shell structure of the PTA filter press has 42.0% and 0.3% failure probabilities in the previous and present cyclic pressure conditions. Furthermore, the hoop stiffener plays an important role in reducing radial displacement and stress amplitude, among which three hoop stiffeners exhibit the most satisfactory optimization.

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Journal articles on the topic 'Life stress assessment'

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