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Journal articles on the topic 'Octahedral shear stress model'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

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1

Cheng, Wangquan (Winston), and Herbert S. Cheng. "Semi-Analytical Modeling of Crack Initiation Dominant Contact Fatigue Life for Roller Bearings." Journal of Tribology 119, no. 2 (April 1, 1997): 233–40. http://dx.doi.org/10.1115/1.2833163.

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The fatigue test of a needle roller bearing suggests that the dominant failure mechanism is subsurface crack initiation and propagation. Therefore, a new semi-analytical contact fatigue model is derived from a micromechanics based crack initiation model. The analysis indicates that in the life calculation the selection of the critical stress, such as the maximum orthogonal shear stress, maximum shear stress, octahedral shear stress, or von Mises equivalent stress, becomes arbitrary under the nonfrictional Hertzian line contact condition. The fatigue life of roller bearings under the pure rolli

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2

Carcione, J. M., F. Poletto, B. Farina, and A. Craglietto. "Simulation of seismic waves at the Earth crust (brittle-ductile transition) based on the Burgers model." Solid Earth Discussions 6, no. 1 (June 11, 2014): 1371–400. http://dx.doi.org/10.5194/sed-6-1371-2014.

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Abstract. The Earth crust presents two dissimilar rheological behaviours depending on the in-situ stress-temperature conditions. The upper, cooler, part is brittle while deeper zones are ductile. Seismic waves may reveal the presence of the transition but a proper characterization is required. We first obtain a stress–strain relation including the effects of shear seismic attenuation and ductility due to shear deformations and plastic flow. The anelastic behaviour is based on the Burgers mechanical model to describe the effects of seismic attenuation and steady-state creep flow. The shear Lamé

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3

Carcione, J. M., F. Poletto, B. Farina, and A. Craglietto. "Simulation of seismic waves at the earth's crust (brittle–ductile transition) based on the Burgers model." Solid Earth 5, no. 2 (September 25, 2014): 1001–10. http://dx.doi.org/10.5194/se-5-1001-2014.

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Abstract. The earth's crust presents two dissimilar rheological behaviors depending on the in situ stress-temperature conditions. The upper, cooler part is brittle, while deeper zones are ductile. Seismic waves may reveal the presence of the transition but a proper characterization is required. We first obtain a stress–strain relation, including the effects of shear seismic attenuation and ductility due to shear deformations and plastic flow. The anelastic behavior is based on the Burgers mechanical model to describe the effects of seismic attenuation and steady-state creep flow. The shear Lam

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4

Ivanova, Olga, Irina Kireeva, and Yuri Chumlyakov. "Modeling of Orientation Dependence of Critical Resolved Shear Stress and Deformation Mechanisms on Yield Point of Austenitic Stainless Steels Hardened by Interstitial and Substitution Atoms." Advanced Materials Research 1013 (October 2014): 264–71. http://dx.doi.org/10.4028/www.scientific.net/amr.1013.264.

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The proposed dislocation model describes the orientation dependence of the critical resolved shear stress (CRSS) and deformation mechanisms on the yield point in single crystals of austenitic stainless steel with nitrogen impurities. The model takes into account the following: the change of the interstitial atom position in the lattice from octahedral interstice to tetrahedral site owing to passage of a leading Shockley’s partial dislocation; the change in the separation width between two partial dislocation in external stress field; the relationship between the width of the extended dislocati

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5

Mousavi, S. Hamed, Mohammed A. Gabr, and Roy H. Borden. "Subgrade resilient modulus prediction using light-weight deflectometer data." Canadian Geotechnical Journal 54, no. 3 (March 2017): 304–12. http://dx.doi.org/10.1139/cgj-2016-0062.

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Resilient modulus has been used for decades as an important parameter in pavement structure design. Resilient modulus, like other elasticity moduli, increases with increasing confining stress and decreases with increasing deviatoric stress. Several constitutive models have been proposed in the literature to calculate resilient modulus as a function of stress state. The most recent model, recommended by the Mechanistic–empirical pavement design guide (MEPDG) and used in this paper, calculates resilient modulus as a function of bulk stress, octahedral shear stress, and three fitting coefficients

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Qian, Junfeng, Yongsheng Yao, Jue Li, Hongbin Xiao, and Shenping Luo. "Resilient Properties of Soil-Rock Mixture Materials: Preliminary Investigation of the Effect of Composition and Structure." Materials 13, no. 7 (April 3, 2020): 1658. http://dx.doi.org/10.3390/ma13071658.

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The physical composition and stress state of soil-rock mixture (SRM) materials have a crucial influence on their mechanical properties, and play a vital role in improving the performance of subgrade. To reveal the resilient behavior and mesostructure evolution of SRM materials, triaxial tests and discrete element method (DEM) numerical analysis have been carried out. In the triaxial test section, the mechanical response of SRM materials was investigated by preparing samples under different stress states and physical states and conducting triaxial tests on samples. Simultaneously, a new irregul

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Tamošiūnas, Tadas, and Šarūnas Skuodis. "Predictive Stress Modeling of Resilient Modulus in Sandy Subgrade Soils." Infrastructures 8, no. 2 (February 8, 2023): 29. http://dx.doi.org/10.3390/infrastructures8020029.

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The mechanical properties of pavement materials are crucial to the design and performance of flexible pavements. One of the most commonly used measures of these properties is the resilient modulus (Er). Many different models were developed to predict the resilient modulus of coarse soils, which are based on the states of stresses and the physical and mechanical properties of the soil. The unconsolidated unsaturated drained cyclic triaxial tests were performed for three variously graded and three well-graded sand specimens to determine the resilient modulus, and to perform predictive modeling u

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8

Zhang, Yongping, Shuai Peng, Xiaoqing Du, Zhenpeng Yu, Jie Wu, Xinghua Xie, and Yanli Hu. "Experimental Study and Theoretical Analysis on the Compression–Shear Multiaxial Mechanical Properties of Recycled Concrete." Materials 15, no. 14 (July 10, 2022): 4810. http://dx.doi.org/10.3390/ma15144810.

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Recycled concrete, which is formed by replacing coarse aggregates in ordinary concrete with recycled aggregates (RA), is of great significance for the secondary utilization of waste building resources. In civil engineering, concrete structures are sometimes subjected to a compression–shear multiaxial stress state. Therefore, research on the compression–shear multiaxial mechanical properties of recycled concrete plays an important role in engineering practice. To explore the effect of RA replacement rate on the compression–shear properties of recycled concrete, an experimental study was carried

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9

KOLCHUNOV, VL I. "DEFORMATION MODEL OF REINFORCED CONCRETE STRUCTURES' RESISTANCE - FROM DISLOCATIONS TO CRACKS." Building and reconstruction 104, no. 6 (2022): 22–39. http://dx.doi.org/10.33979/2073-7416-2022-104-6-22-39.

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The article provides a model of "internal stresses" for concrete matrix of reinforced concrete structures from dislocations, microcracks to macrocracks. The energy theory on the surface of the sphere and the definition of the integral for the mean square value of tangential stresses from plasticity theory are used. An alternative to the general model of the "eight" in the form of a paraboloid from the summation of the volume sectors, levels - radii for the matrix of sliding planes (including octahedral and pure shear) is developed. In the environment of different materials, the model is constr

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10

KOLCHUNOV, VL I. "THE PHYSICAL ESSENCE OF CONCRETE AND REINFORCED CONCRETE RESISTANCE FROM DISLOCATIONS TO CRACKS." Building and reconstruction 102, no. 4 (2022): 15–33. http://dx.doi.org/10.33979/2073-7416-2022-102-4-15-33.

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The physical essence of resistance of concrete and reinforced concrete from dislocations, micro-cracks to macro-cracks and its experimental justification is investigated. For the "eight" structure of crystals of different materials (concrete and steel) a general model in the form of a sphere was developed. For it the summation of volume sectors, levels - radii from the matrix of sliding planes (including octahedral and pure shear) is written down. This uses an alternative to the theory of plasticity in the form of energy interpretation on the surface of the sphere and determining the integral

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11

Ye, Peihuan, Yuliang Chen, Zongping Chen, Jinjun Xu, and Huiqin Wu. "Failure Criteria and Constitutive Relationship of Lightweight Aggregate Concrete under Triaxial Compression." Materials 15, no. 2 (January 10, 2022): 507. http://dx.doi.org/10.3390/ma15020507.

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This paper investigates the compression behavior and failure criteria of lightweight aggregate concrete (LAC) under triaxial loading. A total of 156 specimens were tested for three parameters: concrete strength, lateral confining pressure and aggregate immersion time, and their effects on the failure mode of LAC and the triaxial stress-strain relationship of LAC is studied. The research indicated that, as the lateral constraint of the specimen increases, the failure patterns change from vertical splitting failure to oblique shearing failure and then to indistinct traces of damage. The stress-s

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12

Li, Jue, Jianlong Zheng, Yongsheng Yao, Junhui Zhang, and Junhui Peng. "Numerical Method of Flexible Pavement considering Moisture and Stress Sensitivity of Subgrade Soils." Advances in Civil Engineering 2019 (May 30, 2019): 1–10. http://dx.doi.org/10.1155/2019/7091210.

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Weaknesses of the subgrade structure induce the asphalt surface diseases and shorten the service life of flexible pavement. However, the resilient modulus (Mr) of subgrade soils is difficult to be evaluated directly since the subgrade is hidden and covered by the granular or asphalt layer. This study aimed to establish a numerical approach to predict the dynamic behavior of flexible pavements considering the stress sensitivity and moisture variation of subgrade soils. Firstly, 2D FEM simulations of flexible pavements were performed with half-sine loadings. A constitutive model of subgrade soil

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13

Reis, Luís G., Vitor Anes, Bin Li, and Manuel de Freitas. "Effect of Non-Proportionality in the Fatigue Strength of 42CrMo4 Steel." Materials Science Forum 730-732 (November 2012): 757–62. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.757.

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The unexpected collapse of engineering structures is often caused by the fatigue phenomenon resulting from degradation of mechanical properties of materials due to multiaxial cyclic loadings. The interpretation of such degradation is a topic of intensive research in multiaxial fatigue. The fatigue strength is commonly evaluated by the equivalent stress based on the shear stress in the octahedral plane. However, the use of this kind of equivalent stress in the multiaxial fatigue criteria has been proven to be inappropriate. The degradation of mechanical properties of materials is dependent on s

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14

Arakere, Nagaraj K., and Gregory Swanson. "Fretting Stresses in Single Crystal Superalloy Turbine Blade Attachments." Journal of Tribology 123, no. 2 (June 27, 2000): 413–23. http://dx.doi.org/10.1115/1.1308032.

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Single crystal nickel base superalloy turbine blades are being utilized in rocket engine turbopumps and turbine engines because of their superior creep, stress rupture, melt resistance, and thermomechanical fatigue capabilities over polycrystalline alloys. High cycle fatigue induced failures in aircraft gas turbine and rocket engine turbopump blades is a pervasive problem. Blade attachment regions are prone to fretting fatigue failures. Single crystal nickel base superalloy turbine blades are especially prone to fretting damage because the subsurface shear stresses induced by fretting action a

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15

Arakere, N. K., and G. Swanson. "Effect of Crystal Orientation on Fatigue Failure of Single Crystal Nickel Base Turbine Blade Superalloys." Journal of Engineering for Gas Turbines and Power 124, no. 1 (February 1, 2000): 161–76. http://dx.doi.org/10.1115/1.1413767.

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High cycle fatigue (HCF) induced failures in aircraft gas turbine and rocket engine turbopump blades is a pervasive problem. Single crystal nickel turbine blades are being utilized in rocket engine turbopumps and jet engines throughout industry because of their superior creep, stress rupture, melt resistance, and thermomechanical fatigue capabilities over polycrystalline alloys. Currently the most widely used single crystal turbine blade superalloys are PWA 1480/1493, PWA 1484, RENE’ N-5 and CMSX-4. These alloys play an important role in commercial, military and space propulsion systems. Singl

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16

Vaughan, David G. "Relating the occurrence of crevasses to surface strain rates." Journal of Glaciology 39, no. 132 (1993): 255–66. http://dx.doi.org/10.1017/s0022143000015926.

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AbstractThe presence of crevasses on the surface of ice masses indicates that a fracture criterion has been met. Understanding how crevasses form will provide information about the stress and strain-rate fields in the ice. This study derives a relationship between measurements of strain rate and observations of crevassing on the surface of ice masses. A literature search yielded 17 polar and alpine locations where strain rates had been measured and crevassing recorded. By plotting strain rates (converted to stresses using a creep law) using axes representing the surface-parallel principal stre

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17

Vaughan, David G. "Relating the occurrence of crevasses to surface strain rates." Journal of Glaciology 39, no. 132 (1993): 255–66. http://dx.doi.org/10.3189/s0022143000015926.

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AbstractThe presence of crevasses on the surface of ice masses indicates that a fracture criterion has been met. Understanding how crevasses form will provide information about the stress and strain-rate fields in the ice. This study derives a relationship between measurements of strain rate and observations of crevassing on the surface of ice masses. A literature search yielded 17 polar and alpine locations where strain rates had been measured and crevassing recorded. By plotting strain rates (converted to stresses using a creep law) using axes representing the surface-parallel principal stre

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18

Jun, Li, T. H. Jacka, and W. F. Budd. "Deformation rates in combined compression and shear for ice which is initially isotropic and after the development of strong anisotropy." Annals of Glaciology 23 (1996): 247–52. http://dx.doi.org/10.3189/s0260305500013501.

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Laboratory-prepared fine-grained, initially isotropic polycrystalline ice samples were deformed under conditions of simple shear with simultaneous uniaxial compression at a constant temperature of −2.0°C. The aim was to investigate the effects of stress configuration on the flow rate of initially isotropic ice and on ice with subsequent stress and strain-induced anisotropy. Experiments were carried out for various combinations of shear and compression with shear stress ranging from 0 to 0.49 MPa and compressive stress ranging from 0 to 0.98 MPa, but such that for every experiment the octahedra

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19

Jun, Li, T. H. Jacka, and W. F. Budd. "Deformation rates in combined compression and shear for ice which is initially isotropic and after the development of strong anisotropy." Annals of Glaciology 23 (1996): 247–52. http://dx.doi.org/10.1017/s0260305500013501.

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Laboratory-prepared fine-grained, initially isotropic polycrystalline ice samples were deformed under conditions of simple shear with simultaneous uniaxial compression at a constant temperature of −2.0°C. The aim was to investigate the effects of stress configuration on the flow rate of initially isotropic ice and on ice with subsequent stress and strain-induced anisotropy. Experiments were carried out for various combinations of shear and compression with shear stress ranging from 0 to 0.49 MPa and compressive stress ranging from 0 to 0.98 MPa, but such that for every experiment the octahedra

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20

Prakoso, Akbar Teguh, Hasan Basri, Dendy Adanta, Irsyadi Yani, Muhammad Imam Ammarullah, Imam Akbar, Farah Amira Ghazali, Ardiyansyah Syahrom, and Tunku Kamarul. "The Effect of Tortuosity on Permeability of Porous Scaffold." Biomedicines 11, no. 2 (February 1, 2023): 427. http://dx.doi.org/10.3390/biomedicines11020427.

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In designing porous scaffolds, permeability is essential to consider as a function of cell migration and bone tissue regeneration. Good permeability has been achieved by mimicking the complexity of natural cancellous bone. In this study, a porous scaffold was developed according to the morphological indices of cancellous bone (porosity, specific surface area, thickness, and tortuosity). The computational fluid dynamics method analyzes the fluid flow through the scaffold. The permeability values of natural cancellous bone and three types of scaffolds (cubic, octahedron pillar, and Schoen’s gyro

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21

Lazăr, Ştefan Marian, and Carmen Răcănel. "Flexible Pavement Design Criterion Based on Octahedral Shear Stresses." Romanian Journal of Transport Infrastructure 6, no. 1 (July 1, 2017): 54–65. http://dx.doi.org/10.1515/rjti-2017-0054.

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Abstract The judicious pavement design is the key factor in achieving the longest service life and the lowest maintenance and rehabilitation costs. It is based on the consideration of the phenomena in which the pavement structures are subjected to exploitation and the limitation of their destructive effects. The aim of this study is to verify the possibility of implementing in the flexible pavement structures design practice of another design criterion based on limiting the bituminous mixtures creep phenomenon and that to be called: The criterion of admissible octahedral shear stresses in the

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22

Lian, Y., Z. Xu, H. Pei, C. Liang, Y. Zhang, Z. Wen, and Z. Yue. "Influence of Film-Cooling Hole Arrangement on Mechanical Properties of Cooled Turbine Blade Based on the Crystal Plastic Theory." Journal of Mechanics 35, no. 6 (August 8, 2019): 809–28. http://dx.doi.org/10.1017/jmech.2019.4.

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ABSTRACTThe crystal plastic theory was used to examine the effect of film-cooling hole arrangements on mechanical properties of cooled turbine blade. The finite element method was used to analyze the maximum von Mises stress and resolved shear stress of an octahedral slip system considering the number of rows, diameter, spacing, and tangential-to-longitudinal hole spacing (h/l) ratio. The different arrangements were found to have a significant influence on the maximum von Mises stress and resolved shear stress. For the triangular arrangement, the von Mises stress and resolved shear stress were

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23

Yu, Qing Min, Zhu Feng Yue, and Yong Shou Liu. "Numerical Study on Elastic-Plastic Stress Field Near the Cooling Holes of Nickel-Based Single Crystal Air-Cooled Blades." Key Engineering Materials 324-325 (November 2006): 563–66. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.563.

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In this paper, a plate containing a central hole was used to simulate gas turbine blade with cooling hole. Numerical calculations based on crystal plasticity theory have been performed to study the elastic-plastic stress field near the hole under tension. Two crystallographic orientations [001] and [111] were considered. The distributions of resolved shear stresses and strains of the octahedral slip systems {110}<112> were calculated. The results show that the crystallographic orientation has remarkable influence on both von Mises stress and resolved shear stress distributions. The resol

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24

Marusic, Ivan, Romain Mathis, and Nicholas Hutchins. "A wall-shear stress predictive model." Journal of Physics: Conference Series 318, no. 1 (December 22, 2011): 012003. http://dx.doi.org/10.1088/1742-6596/318/1/012003.

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25

Ezewu, K. "Design of an NPK fertilizer pelletizer." Nigerian Journal of Technology 40, no. 5 (May 13, 2022): 837–45. http://dx.doi.org/10.4314/njt.v40i5.9.

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Fertilizer application to boost crop yield has become inevitable and can be a source of environmental concern. In this study, the design of simple pelletizing equipment was considered to process fertilizer powder into pellets. This equipment was designed to convey, compact and extrude the NPK compound via a screw conveyor, through a die and into pellets. On the basis of the size of this home-made system and the bulk density of inorganic NPK compounds, a 1492 watts (2hp) motor and a 25mm diameter shaft of screw conveyor was used to convey the NPK compound at a rate of 3.0m3/h, and then compacte

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26

Budd, William F., Roland C. Warner, T. H. Jacka, Jun Li, and Adam Treverrow. "Ice flow relations for stress and strain-rate components from combined shear and compression laboratory experiments." Journal of Glaciology 59, no. 214 (2013): 374–92. http://dx.doi.org/10.3189/2013jog12j106.

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AbstractThe generalized (Glen) flow relation for ice, involving the second invariants of the stress deviator and strain-rate tensors, is only expected to hold for isotropic polycrystalline ice. Previous single-stress experiments have shown that for the steady-state flow, which develops at large strains, the tertiary strain rate is greater than the minimum (secondary creep) value by an enhancement factor which is larger for shear than compression. Previous experiments combining shear with compression normal to the shear plane have shown that enhancement of the tertiary octahedral strain rate in

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27

Gardner, Trevor Noel, Sanjay Mishra, and Laurence Marks. "The role of osteogenic index, octahedral shear stress and dilatational stress in the ossification of a fracture callus." Medical Engineering & Physics 26, no. 6 (July 2004): 493–501. http://dx.doi.org/10.1016/j.medengphy.2004.03.009.

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28

Wang, Jingrong, Faxiang Xie, Chuanlong Zhang, and Jing Ruan. "Experimental Study and Failure Criterion Analysis on Combined Compression-Shear Performance of Self-Compacting Concrete." Materials 13, no. 3 (February 5, 2020): 713. http://dx.doi.org/10.3390/ma13030713.

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To investigate the combined compression-shear performance of self-compacting concrete (SCC), eight groups of concrete specimens under different axial compression ratios were designed, and the composite performance under different axial stresses was carried out by hydraulic servo machine. The uniaxial and tensile splitting strength of SCC were also included in the study. The failure modes of SCC were presented, discussed, and compared with normal concrete (NC). The characteristic points of stress-strain curves of SCC specimens from the experiments were extracted and analyzed under different axi

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Zhang, Juntao, Zhenpeng Yu, Xinjian Sun, Guangli Zhang, and Wenguo Pan. "Experimental Study and Failure Mechanism Analysis of Rubber Fiber Concrete under the Compression-Shear Combined Action." Advances in Materials Science and Engineering 2021 (July 6, 2021): 1–16. http://dx.doi.org/10.1155/2021/5554257.

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In order to examine the compression-shear combined mechanical properties of rubber fiber concrete, an experimental study was carried out on rubber fiber concrete of three different configurations using a material compression-shear testing machine by considering different axial compression ratios. The failure modes and shear stress-strain curves of rubber fiber concrete under different loading conditions were obtained. By comparatively analyzing the mechanical parameters of rubber fiber concrete under different axial compression ratios, the following conclusions were drawn. With the increase of

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30

Boyer, Jean-Claude, Emmanuelle Vidal-Sallé, and Carole Staub. "A shear stress dependent ductile damage model." Journal of Materials Processing Technology 121, no. 1 (February 2002): 87–93. http://dx.doi.org/10.1016/s0924-0136(01)01212-2.

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Treverrow, Adam, William F. Budd, Tim H. Jacka, and Roland C. Warner. "The tertiary creep of polycrystalline ice: experimental evidence for stress-dependent levels of strain-rate enhancement." Journal of Glaciology 58, no. 208 (2012): 301–14. http://dx.doi.org/10.3189/2012jog11j149.

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AbstractLaboratory creep deformation experiments have been conducted on initially isotropic laboratory-made samples of polycrystalline ice. Steady-state tertiary creep rates, , were determined at strains exceeding 10% in either uniaxial-compression or simple-shear experiments. Isotropic minimum strain rates, , determined at ˜1 % strain, provide a reference for comparing the relative magnitude of tertiary creep rates in shear and compression through the use of strain-rate enhancement factors, E, defined as the ratio of corresponding tertiary and isotropic minimum creep rates, i.e. . The magnitu

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Xi, Xiao Hua, and Shuan Cheng Gu. "Shearing Stress Model of Damage Bolt in Tunnel." Applied Mechanics and Materials 90-93 (September 2011): 1761–67. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.1761.

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When bolt is damaged, character of stress is different from character of shear stress integrated bolt. Firstly, Based on the displacement formula of the tunnel surrounding rock，the shear stress and axial force calculation formula of integrated bolt are educed. Subsequence, based on the BOUSSINESG formula of displacement, models on fully grouted bolt shear stress and axial force of uniform rock are educed under pullout load. Consequently, the author deduces shear stress model of bolt damage (completely void of bolt and grouting), combining modes on shear stress and axial force of integrated bol

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Chang, Le, Yanlin Zhao, Yixian Wang, and Tao Tan. "Direct Shear Test and Shear Strength Model of Clay-Filled Joints." Applied Rheology 31, no. 1 (January 1, 2021): 50–62. http://dx.doi.org/10.1515/arh-2020-0119.

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Abstract To better study the shear characteristics of infilled joints with soil having different moisture contents, the influence of the moisture content on the shear characteristics of the infilled joint was explored in this paper, and a revised shear strength model of infilled joint surface is proposed. The results show that the shear dilatation modes of joints can be divided into four types: pure shear dilatation, pure shear compression, shear dilation-shear compression and shear compression-shear dilation. As the joint roughness coefficient (JRC) value increases, the normal displacement of

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34

Lou, Yan Shan, and Jeong Whan Yoon. "A Stress-Based Model for Shear Ductile Fracture." Key Engineering Materials 794 (February 2019): 3–8. http://dx.doi.org/10.4028/www.scientific.net/kem.794.3.

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A stress-based model is developed to describe shear ductile fracture of lightweight metals. The proposed function couples the effect of the maximum shear stress and the stress triaxiality on fracture limits of metals during plastic deformation. Effect of the maximum shear stress in the proposed fracture model is correlated with the influence of the Lode parameter on fracture limits. The proposed fracture model is applied to depict the fracture locus of AA2024-T351. The predicted fracture locus is compared with experimental results of the alloy. The comparison demonstrates that the proposed fra

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35

Vitillo, F., C. Galati, L. Cachon, E. Laroche, and P. Millan. "An anisotropic shear stress transport (ASST) model formulation." Computers & Mathematics with Applications 70, no. 9 (November 2015): 2238–51. http://dx.doi.org/10.1016/j.camwa.2015.08.023.

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36

Osakue, Edward E., and Lucky Anetor. "Revised Lewis Bending Stress Capacity Model." Open Mechanical Engineering Journal 14, no. 1 (July 31, 2020): 1–14. http://dx.doi.org/10.2174/1874155x02014010001.

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Background: During operation, cylindrical gearset experiences tangential, radial, and axial (helical gears only) force components that induce bending, compressive, and shear stresses at the root area of the gear tooth. Accurate estimation of the effective bending stress at the gear root is a challenge. Lewis was the first person who attempted estimating the root bending stress of spur gears with some reasonable accuracy. Various gear standards and codes in use today are modifications and improvements of the Lewis model. Objective: This research aims at revising the Lewis model by making adjust

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37

Johnson, Clarence E., Alvin C. Bailey, and Thomas R. Way. "A Shearing Strain Model for Cylindrical Stress States." Transactions of the ASABE 62, no. 1 (2019): 225–30. http://dx.doi.org/10.13031/trans.12725.

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Abstract. A shearing strain model for soil was developed that includes soil behavior under compressive normal and shear stresses great enough to attain maximum compaction. The model was developed for a clay and a clay loam from triaxial data with various stress loading paths. This model relates the ratio of maximum shear stress acting on the cylindrical sample (tmax) to major principal stress (s1), to the ratio of maximum natural shearing strain to natural volumetric strain occurring after shear stress is initiated. The model accurately describes the shearing distortion of triaxial soil sample

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Wang, Shuai, Lianguo Wang, Jiansheng Tian, Hao Fan, Chongyang Jiang, and Ke Ding. "An Experimental Study on the Effects of True Triaxial Loading and Unloading Stress Paths on the Mechanical Properties of Red Sandstone." Minerals 12, no. 2 (February 5, 2022): 204. http://dx.doi.org/10.3390/min12020204.

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Loading and unloading stress paths play critical roles in investigating the deformation and failure of roadway excavation. In this study, tests under four different loading and unloading stress paths were conducted on red sandstone samples, with the aid of a self-developed true triaxial test system. Meanwhile, the deformation and failure characteristics of the samples were monitored during the tests. The following research conclusions were obtained: The octahedral shear stress is linearly correlated with the average effective stress, and the correlation coefficient R2 is 0.9825. The Mogi–Coulo

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Song, Zhenlong, Minghui Li, Guangzhi Yin, Pathegama Ranjith, Dongming Zhang, and Chao Liu. "Effect of Intermediate Principal Stress on the Strength, Deformation, and Permeability of Sandstone." Energies 11, no. 10 (October 10, 2018): 2694. http://dx.doi.org/10.3390/en11102694.

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Although the mechanical behaviors and flow aspects of sandstone have been previously investigated, studies of the effect of the intermediate principal stress (σ2) on the strength, deformation, and permeability of sandstone are lacking. In this work, the mechanical behaviors and permeability of sandstone under true triaxial stress conditions were investigated using a newly developed true triaxial geophysical apparatus. The experimental results showed that with increasing σ2, the peak strength, octahedral effective normal stress, and octahedral effective shear stress of the sandstone increased,

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Telesman, J., and L. J. Ghosn. "Fatigue Crack Growth Behavior of PWA 1484 Single Crystal Superalloy at Elevated Temperatures." Journal of Engineering for Gas Turbines and Power 118, no. 2 (April 1, 1996): 399–405. http://dx.doi.org/10.1115/1.2816603.

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A study was done to determine the fatigue crack growth behavior of a PWA 1484 single-crystal nickel-base superalloy in a temperature range of 427°C to 871°C. Two distinctive failure modes were observed, which were a function of both temperature and frequency. At lower temperatures and higher frequencies crack growth occurred on the {111} octahedral slip planes at an oblique angle to the loading direction. Higher temperatures and decrease in frequencies favored angle to the loading direction. Higher temperatures and decrease in frequencies favored a Mode I type failure process. The failure mode

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Young, N. W., and G. Hyland. "Velocity and strain rates derived from InSAR analysis over the Amery Ice Shelf, East Antarctica." Annals of Glaciology 34 (2002): 228–34. http://dx.doi.org/10.3189/172756402781817842.

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AbstractWe use displacements derived from matching complex synthetic aperture radar data using maximum coherence to generate a dense network of velocity estimates over the Amery Ice Shelf. From these velocities we generate the horizontal strain-rate components and resolve them with respect to the local flow direction. We present the spatial distributions of velocity and transverse shear strain rate and use them to investigate features of the flow regime for the shelf. From the southern end of the shelf, velocity decreases from a high of about 800ma–1 to around 300 ma–1, and then increases to a

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Suzuki, Kaho, Atsushi Suzuki, and Yoshihiro Kimura. "Ultimate Shear Strength of Component Model of Composite Beam with Perfobond Shear Connector." Materials Science Forum 1047 (October 18, 2021): 214–19. http://dx.doi.org/10.4028/www.scientific.net/msf.1047.214.

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In general, a steel beam is assembled with a concrete slab by shear connectors. The connection requires high stiffness and strength to secure the composite effect even in the ultimate state. Facing this need, perfobond shear connectors are attracting a great attention by virtue of its outstanding mechanical performance. However, the connector is subjected to the fully reversed cyclic stress between the compression and tension during an earthquake. Therefore, as presented in the earlier research addressing stud shear connectors, the concrete may originate cracks under the tensile stress; and ev

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Sta˚hl, Jonas, and Bo O. Jacobson. "A Lubricant Model Considering Wall-Slip in EHL Line Contacts." Journal of Tribology 125, no. 3 (June 19, 2003): 523–32. http://dx.doi.org/10.1115/1.1537750.

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A wall-slip model including limiting shear stress and the occurrence of slip at the interfaces between the lubricant and the adjacent surfaces is presented. The lubricant model is applied to EHL line contacts using smooth surfaces and isothermal conditions. The main part of the model concerns the lubricant velocities at the surfaces that are decoupled from the corresponding surface velocity giving two new variables in the EHL equations. The lubricant velocities at the surfaces are related to the corresponding shear stresses. As long as the value of the shear stress is below the limiting shear

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Galkin, Siegfried, Fabian J. Schirmaier, and Luise Kärger. "Simplified phenomenological model of the nonlinear behavior of FRPs under combined stress states." Journal of Composite Materials 52, no. 4 (June 1, 2017): 475–85. http://dx.doi.org/10.1177/0021998317709332.

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Nonlinear material behavior of FRPs under shear loading is widely observed and investigated. In case of combined stress states under tension and shear, an interaction between the macroscopic shear stress–strain curve evolution and the applied tension has been observed and described by several publications in the past. In the present work, the available experimental data with combined stress states are evaluated and a specific threshold shear stress is found, above which nonlinear material behavior occurs for all stress states. Further, a new simplified phenomenological model is derived to mode

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Du, Cheng Bin, Fei Guo, and Guo Jun Yu. "Study on the Rheological Properties and Shear Model for Magneto-Rheological Fluids." Applied Mechanics and Materials 635-637 (September 2014): 70–75. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.70.

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In this paper, the influence of the soft magnetic particle content on the properties of MRFs is studied. Besides, the relationships between the shear stress of MRFs and the magnetic induction intensity, the soft magnetic particle content, and the shear rate are discussed. The curve equation that expresses the relationship between the shear stress, the magnetic induction intensity, and the soft magnetic particle content is established through the fitting of experimental data. The results show that the shear stress of MRFs increases with increasing magnetic induction intensity and that the shear

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Woelke, Pawel, Ka-Kin Chan, Raymond Daddazio, and Najib Abboud. "Stress Resultant Based Elasto-Viscoplastic Thick Shell Model." Shock and Vibration 19, no. 3 (2012): 477–92. http://dx.doi.org/10.1155/2012/267014.

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The current paper presents enhancement introduced to the elasto-viscoplastic shell formulation, which serves as a theoretical base for the finite element code EPSA (Elasto-Plastic Shell Analysis) [1–3]. The shell equations used in EPSA are modified to account for transverse shear deformation, which is important in the analysis of thick plates and shells, as well as composite laminates. Transverse shear forces calculated from transverse shear strains are introduced into a rate-dependent yield function, which is similar to Iliushin's yield surface expressed in terms of stress resultants and stre

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Genova, Lauren A., Melanie F. Roberts, Yu-Chern Wong, Christine E. Harper, Ace George Santiago, Bing Fu, Abhishek Srivastava, et al. "Mechanical stress compromises multicomponent efflux complexes in bacteria." Proceedings of the National Academy of Sciences 116, no. 51 (November 26, 2019): 25462–67. http://dx.doi.org/10.1073/pnas.1909562116.

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Physical forces have a profound effect on growth, morphology, locomotion, and survival of organisms. At the level of individual cells, the role of mechanical forces is well recognized in eukaryotic physiology, but much less is known about prokaryotic organisms. Recent findings suggest an effect of physical forces on bacterial shape, cell division, motility, virulence, and biofilm initiation, but it remains unclear how mechanical forces applied to a bacterium are translated at the molecular level. In Gram-negative bacteria, multicomponent protein complexes can form rigid links across the cell e

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Yong, Li, Wu Jing'an, and Du Xingwen. "Viscoelastic Constitutive Model of Unvulcanized Rubber." Polymers and Polymer Composites 13, no. 7 (October 2005): 727–36. http://dx.doi.org/10.1177/096739110501300709.

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Based on rheological test results, a new viscoelastic constitutive equation for unvulcanized rubber has been set up, with mathematical justification to describe its mechanical properties in relation to the yield stress and shear-thinning effect. In this model, every term or coefficient has an explicit physical meaning. The proposed model indicates that the yield stress is one of the main causes for the shear-thinning effect and reveals why some materials possess double-Newtonian regions with the shear viscosity in the first region higher than that in the second region. The yield stress makes t

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Lucchesi, Massimiliano, Barbara Pintucchi, and Nicola Zani. "A 3D Masonry-Like Model with Bounded Shear Stress." Key Engineering Materials 747 (July 2017): 20–27. http://dx.doi.org/10.4028/www.scientific.net/kem.747.20.

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This paper deals with non linear elastic materials for which not all the stresses are admis-sible but only those which belong to the stress range, i.e. a closed and convex subset of the spaceof all symmetric tensors. The constitutive equation that has been formulated and explicitly solved issufficiently general to include, besides the so-called masonry-like materials, many others whose stressrange is obtained experimentally or is theoretically defined. The model, implemented into the finiteelement code MADY, has been used to analyze a masonry panel under a bi-directional monotonicallyincrement

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Ito, Kousuke, Jang-Woon Choi, Haruo Isoda, and Koichi Nishino. "Measurement of wall shear stress in cerebral aneurysm model." Journal of the Visualization Society of Japan 26, Supplement2 (2006): 81–84. http://dx.doi.org/10.3154/jvs.26.supplement2_81.

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