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Journal articles on the topic 'Diagram of fracture strain'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Vilotic, Dragisa, Sergei Alexandrov, Aljosa Ivanisevic, and Mladomir Milutinovic. "Reducibility of Stress-Based Workability Diagram to Strain-Based Workability Diagram." International Journal of Applied Mechanics 08, no. 02 (2016): 1650022. http://dx.doi.org/10.1142/s1758825116500228.

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The strain-based and stress-based workability diagrams are often used to predict the initiation of ductile fracture in metal forming. The strain-based workability diagram is restricted to free surface fracture and postulates that the initiation of fracture is independent of the strain path. It is shown in the present paper that under these conditions the strain-based workability diagram is identical to the stress-based workability diagram. Using an available stress-based workability diagram the strain-based workability diagram is found in a much larger domain in the space of two in-surface pri

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2

Movrin, Dejan, Mladomir Milutinovic, Marko Vilotic, Sergei Alexandrov, and Lihui Lang. "A Method for Determining the Workability Diagram by Varying Friction Conditions in the Upsetting of a Cylinder between Flat Dies." Crystals 11, no. 11 (2021): 1411. http://dx.doi.org/10.3390/cryst11111411.

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This paper aims to develop a method for determining the workability diagram by varying frictional conditions in the cylinder upsetting test. The method is based on a known theoretical relationship between the average stress triaxiality ratio and in-surface strains if the initiation of fracture occurs at a traction-free surface. This relationship is valid for any rigid/plastic strain hardening material obeying the Mises-type yield criterion and its associated flow rule, which shows the wide applicability of the method. The experimental input to the method is the strain path at the site of fract

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3

Budden, P. J. "Failure assessment diagram methods for strain-based fracture." Engineering Fracture Mechanics 73, no. 5 (2006): 537–52. http://dx.doi.org/10.1016/j.engfracmech.2005.09.008.

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4

Li, Fei-Fan, Gang Fang, and Ling-Yun Qian. "Forming limit analysis of Mg-2Zn-1.2Al-0.2Ca-0.2RE alloy sheet using ductile fracture models." International Journal of Damage Mechanics 29, no. 8 (2019): 1181–98. http://dx.doi.org/10.1177/1056789519855763.

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This work was aimed to experimentally and theoretically investigate the formability of a new magnesium alloy sheet at room temperature. The fracture forming limit diagram was predicted by MMC3 and DF2014 models, where the non-linear strain path effect was taken into account by means of damage accumulation law. In order to obtain the instantaneous values of the stress triaxiality and the Lode parameter during the deformation process, strains tracked by digital image correlation technique were transformed into stresses based on the constitutive equations. The fracture forming limit diagram predi

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5

Mohamed, M. Jinnah Sheik, and N. Selvakumar. "Studies on Formability Behaviour of Aluminium Alloy Sheets with Ceramic Nanocoatings." Advanced Materials Research 984-985 (July 2014): 482–87. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.482.

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Forming limit diagram presents limit strains for different linear strain paths. In other words it indicates localized formability of sheet metals under different proportional loading and is considered a powerful tool for trouble shooting in sheet-metal forming industries. In this study in-plane and out-of-plane forming limit diagrams were determined for aluminum 5052. In the experimental works, all specimens were prepared in the rolling direction and annealed before testing. Forming up to fracture was carried out on INSTRON UTM with a tensile force of 1N. The sheet samples were subjected to te

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6

Lomunov, A. K., T. N. Yuzhina, L. Kruszka, and W. W. Chen. "DEFORMING AND FRACTURE OF LINDEN AND PINE UNDER INTENSIVE DYNAMIC IMPACTS." Problems of strenght and plasticity 82, no. 1 (2020): 43–51. http://dx.doi.org/10.32326/1814-9146-2020-82-1-43-51.

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The paper presents the results of dynamic tests under compression of two wood species: linden and pine under loading along and across the fibers. Dynamic tests were carried out using the modified Kolsky method with the realization of multi-cycle loading of the sample during one test. As a result, strain diagrams were obtained for uniaxial stress state taking into account additional loading cycles The use of the multi-cycle loading mode made it possible to obtain a significantly greater degree of the sample deformation than with traditional single-cycle loading. To create a pulse load, a gas gu

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7

Mironov, Vladimir I., Olga A. Lukashuk, and Ivan S. Kamantsev. "Experimental Study of Strain-Softening Stage in Materials." Materials Science Forum 946 (February 2019): 276–81. http://dx.doi.org/10.4028/www.scientific.net/msf.946.276.

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Physical theory of reliability is based on research into degradation processes of various origins which take place in a material of a stressed construction. Experimental evaluation of parameters carried out for such processes is a practically important problem by itself. One of the approaches to solving this problem is related to the studies into the stage of material softening due to deformation. This paper analyzes the issues of experimental validation of material softening properties in terms of a phenomenological approach to the problem of structural fracture. Results of deformation analys

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8

Makhutov, N. A., and M. M. Gadenin. "Study of the generalized curves of the static and cyclic deformation, damage and fracture." Industrial laboratory. Diagnostics of materials 89, no. 5 (2023): 46–55. http://dx.doi.org/10.26896/1028-6861-2023-89-5-46-55.

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Individual deformation diagrams of all materials on metal, non-metal, or composite base under static and cyclic load link stresses and strains. These diagrams are obtained in standard tensile, compression, torsion or bending tests of laboratory samples with the registration of forces and deformations of their working parts upon loading. The diagram for a single static deformation in the stress-strain coordinates in this case covers both the region of elastic deformations and the region of elastic-plastic deformation, when deformations are localized in the neck of the loaded sample up to the mo

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9

Qian, Z., Guang Ye, Erik Schlangen, and Klaas van Breugel. "3D Lattice Fracture Model: Application to Cement Paste at Microscale." Key Engineering Materials 452-453 (November 2010): 65–68. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.65.

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The fracture processes in cement paste at microscale are simulated by the 3D lattice fracture model based on the microstructure of hydrating cement paste. The uniaxial tensile test simulation is carried out to obtain the load-displacement diagram and microcracks propagation for a Portland cement paste specimen in the size of 100×100×100 µm3 at the degree of hydration 69%. The Young's modulus, tensile strength, strain at peak load and fracture energy are computed on the basis of the load-displacement diagram.

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10

Lyamina, Elena, Alexander Pirumov, and Yeong Maw Hwang. "An Approach for Predicting the Initiation of Ductile Fracture in Plane Strain Rolling." Key Engineering Materials 827 (December 2019): 379–84. http://dx.doi.org/10.4028/www.scientific.net/kem.827.379.

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The paper extends Orowan’s method to the prediction of ductile fracture in plane strain rolling. In general, any uncoupled ductile fracture criterion can be used in conjunction with the solution found. However, the present paper focuses on a ductile fracture criterion based on the workability diagram. It is assumed that the initiation of fracture occurs at the axis of symmetry.

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11

Lyamina, E. A. "Through-thickness damage distribution in sheet bending employing the workability diagram." VESTNIK of Samara University. Aerospace and Mechanical Engineering 23, no. 4 (2024): 133–43. https://doi.org/10.18287/2541-7533-2024-23-4-133-143.

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A semi-analytical solution is constructed to determine the through-thickness distribution of the average stress triaxiality parameter included in the ductile fracture criterion in sheet bending under the action of a bending moment and tensile force. It is assumed that the condition of the sheet is plain-strain. The sheet material is elastic-plastic, and the uniaxial yield stress is an arbitrary function of the equivalent plastic strain. The solution allows for predicting the occurrence of plastic fracture and the distribution of the degree of use of the plasticity reserve over the sheet thickn

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12

Kovar, Martin, and Marek Foglar. "Design and Evaluation of the Method of Parameterization of the Force-Deflection Diagram of FRC." Advanced Materials Research 1106 (June 2015): 98–101. http://dx.doi.org/10.4028/www.scientific.net/amr.1106.98.

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Fiber-reinforced concrete (FRC) has mechanical properties that enhance its suitability for use in structures subjected to high strain rates, e.g. blast or impact loading. The fracture energy value is the decisive material characteristic for assessing the damage to concrete structures due to loadings with high strain rates. An analytical description of the force-deflection diagram of FRC can be a very efficient instrument for making a preliminary estimate of the fracture and mechanical properties of FRC. On the basis of our experiments and experiments from other authors, a tool for an analytica

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13

Ali, Walid Jalal, and Anas Obed Idres. "Affecting the Determination of Forming Limit Diagram for Sheet Metals." Tikrit Journal of Engineering Sciences 12, no. 4 (2005): 67–98. http://dx.doi.org/10.25130/tjes.12.4.10.

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The sheet metal forming is defined as the ability of metal to deform plastically (stretch forming) without necking or fracture. To control the sheets forming operation failure a diagram is used , in which the ; accepted forming , failure and critical regions are shown.This diagram is known as “Forming Limit Diagram”(FLD) . It is considered as an important tool todetermine the formability of sheet metals . The forming limit diagrams for Aluminum , low carbon Steel and Brass were constructed experimentally as received and after annealing (with and without lubrication). Results have shown that th

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14

ZHAO, MIN, JIANGJUN ZHOU, ZHUANYI YU, et al. "A NEWLY DESIGNED ASSEMBLY LOCKING COMPRESSION PLATE TO TREAT COMMINUTED FRACTURES OF THE FEMORAL SHAFT: A BIOMECHANICAL STUDY." Journal of Mechanics in Medicine and Biology 19, no. 06 (2019): 1950059. http://dx.doi.org/10.1142/s0219519419500593.

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The aim of this paper is to compare the biomechanical characteristics of a newly designed assembly locking compression plate (NALCP) and traditional locking compression plate (LCP) for internal fixation of femoral-shaft comminuted fractures. A femoral-shaft wedge fracture model (AO classification 32-C2.1) was created in six pairs of femoral specimens ([Formula: see text]) randomly divided into two equal groups. Biomechanical properties were tested with axial and torsional loading tests. The relative maximum displacement of fracture blocks and strain was recorded. A strain diagram was made; the

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15

Venkatachalam, G., S. Narayanan, and Narayanan C. Sathiya. "Prediction of Limiting Strains for Square Pattern – Square Hole Perforated Commercial Pure Aluminium Sheets." Advanced Materials Research 548 (July 2012): 382–86. http://dx.doi.org/10.4028/www.scientific.net/amr.548.382.

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Forming limit diagram (FLD) is the most appropriate tool used to obtain the safe strain region in sheet metal forming industries. This FLD is based on limiting values of major and minor strains. This Limiting strain is the strain at the onset of fracture / necking in a sheet metal. It is influenced by the material / condition of the material, strain condition in geometrical features of a sheet metal. In this paper, square pattern – square holed, perforated commercial aluminium sheets are considered for the study. The limiting strain for the above perforated sheet metals is predicted using fini

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16

Park, Namsu, Hoon Huh, and Jeong Whan Yoon. "Anisotropic fracture forming limit diagram considering non-directionality of the equi-biaxial fracture strain." International Journal of Solids and Structures 151 (October 2018): 181–94. http://dx.doi.org/10.1016/j.ijsolstr.2018.01.009.

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17

Rubešová, Kateřina, Martin Rund, Sylwia Rzepa, et al. "Determining Forming Limit Diagrams Using Sub-Sized Specimen Geometry and Comparing FLD Evaluation Methods." Metals 11, no. 3 (2021): 484. http://dx.doi.org/10.3390/met11030484.

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Sheet metal forming boundaries are established using the forming limit diagram (FLD). The Nakajima and Marciniak tests, which are based on stretching a material using a punch, are the most commonly used methods for determining the FLD or fracture forming limit diagram (FFLD). The results are usually evaluated by calculating local strain, strain rates, specimen thickness reduction or fracture strain. When the amount of experimental material is insufficient, miniaturization of the testing specimens may be a solution. However, the interchangeability of the results for standard and miniaturized sp

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18

Vasyliev, Leonid, Yurii Bulich, Dmytro Vasyliev, et al. "Spall fracture forms of high rock samples under uniaxial compression." IOP Conference Series: Earth and Environmental Science 1156, no. 1 (2023): 012036. http://dx.doi.org/10.1088/1755-1315/1156/1/012036.

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Abstract Prof. L.I. Baron identified five forms of destruction during uniaxial compression of samples of regular geometry of rocks including truncated wedge, wedge, diagonal, longitudinal, and explosive forms. All of them are commonly characterized by the destruction of samples in their central parts showing two or more cracks, while the trajectories of crack development align with the corner points of the samples. Recently, was unexpectedly discovered a spall fracture in the form of a single crack emerged from the side wall of the specimen and propagating into it under uniaxial compression. B

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19

Kolesnikov, Gennadiy. "Analysis of Concrete Failure on the Descending Branch of the Load-Displacement Curve." Crystals 10, no. 10 (2020): 921. http://dx.doi.org/10.3390/cryst10100921.

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In this paper, load-displacement and stress-strain diagrams are considered for the uniaxial compression of concrete and under three-point bending. It is known that the destruction of such materials occurs on the descending branch of the load-displacement diagram. The attention of the presented research is focused on the explanation of this phenomenon. Fracture mechanics approaches are used as a research tool. The method for determining effective stresses and modulus of elasticity of concrete based on the results of uniaxial compression tests has been substantiated. The ratios necessary for the

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20

Zhou, Lin, and Xiao Min Cheng. "Prediction of T-Shaped Tube Hydroforming Stress Limit." Key Engineering Materials 480-481 (June 2011): 1140–43. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.1140.

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Tube hydroforming has been widely used in auto industry due to its remarkable advantages compared with conventional manufacturing via stamping and welding. The forming limit stress diagram (FLSD) which is independent of strain paths is of great significance to tube hydroforming. The FLSD of 2008T4 tube blank was established to predict fracture defect in T-shaped tube hydroforming simulation. By numerical simulation method, the stress limit and strain limit were analyzed and fracture defects were predicted. Two prediction results of the fracture defects location were the same yet the limit pres

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21

Magliaro, John, Amir M. K. Behtash, and Ahmet T. Alpas. "Formability limits, damage and fracture mechanisms in AA5182 Al-Mg sheets formed under subzero temperature conditions." MATEC Web of Conferences 408 (2025): 02014. https://doi.org/10.1051/matecconf/202540802014.

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The applicability of in demand lightweight Al-Mg alloys is constrained by limited formability and surface defects caused by the Portevin-Le Chatelier (PLC) effect, which manifests as serrated plastic flow due to dynamic strain aging. This study investigated the formability limits, damage and fracture mechanisms for commercially available AA5182 sheets subjected to tensile and Erichsen punch forming tests under room (293 K) and cryogenic (77 K) conditions, that latter was achieved using a liquid nitrogen reservoir. The sheet fracture strain and flow strength increased by 47% and 91%, respective

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22

Kaputkina, Liudmila M., Vera Prokoshkina, and Yu I. Lojnikov. "Hot Strain Diagrams, Strengthening and Recrystallization of Nitrogen Alloyed Steels." Materials Science Forum 467-470 (October 2004): 281–86. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.281.

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Kinetics of deformation strengthening, polygonization and recrystallization processes have been studied, effects of alloying by nitrogen, combined carbon and nitrogen as well as by various other elements (Cr, Mo, Ni, Mn, V etc.) have been estimated for steels of different compositions and applications. Strain diagrams and structure state maps for the studied steels are presented. Strain diagram shape and attainable hot strength depend on the deformation conditions and basic alloying which determine strain hardening and diffusional processes of post-deformation softening. Alloying by nitrogen i

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23

Swaminathan, K., P. P. Date, and K. A. Padmanabhan. "Room Temperature Formability and Fracture Behavior of a High Strength AI-Zn-Mg Alloy." Journal of Engineering Materials and Technology 113, no. 2 (1991): 236–43. http://dx.doi.org/10.1115/1.2903398.

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The formability and fracture behavior of a high strength, aluminum alloy made to (French) specification AFNOR 7020 is reported. The formability study included the evaluation of the room temperature forming limit diagram (FLD) of the material in the T4 temper and an analysis of the strain distribution profiles obtained in punch stretching that involved different stress states. The fracture surfaces were examined by scanning electron microscopy and a correlation between the forming and fracture behavior could be obtained.

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24

Situ, Q., Mukesh K. Jain, and M. Bruhis. "A Suitable Criterion for Precise Determination of Incipient Necking in Sheet Materials." Materials Science Forum 519-521 (July 2006): 111–16. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.111.

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Forming limit diagram (FLD) is a measure of the formability of a sheet material. The major-minor strain pairs that are closest to the neck on multiple specimens of various strain paths are utilized to construct a boundary between safe and unsafe zones. The challenge to obtain the FLD is the determination of incipient necking. Three approaches to determine the limit strains have been investigated and compared in this research in order to establish the optimal one for implementation: (1) commonly used Bragard criterion ( 1)e Br with periodic grids; (2) tracking the region of large local strains

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25

Gadenin, M. M. "Computation and experimental analysis of the resistance of superalloys to low cycle deformations." Industrial laboratory. Diagnostics of materials 88, no. 9 (2022): 61–68. http://dx.doi.org/10.26896/1028-6861-2022-88-9-61-68.

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Diagrams of cyclic elastoplastic deformation in a general case characterize the resistance of a material to a low cycle loading and display a relation between current values of stresses and strains during deformation process. Those diagrams in the mechanics of deformation and fracture are described by rather complicated state equations with a nonlinear dependence on conditions and modes of loading including temperature, deformation rate, cycle form, type of the stress state, absolute size of sections, working medium, type of constructional material, etc. The entity of aforementioned factors af

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26

Peng, Yanyan, Xiao Cheng, Nan Song, Qi Qin, Xiaoyun Zhang, and Manchao He. "Study on Crack Propagation and Coalescence in Fractured Limestone Based on 3D-DIC Technology." Energies 15, no. 6 (2022): 2007. http://dx.doi.org/10.3390/en15062007.

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To deeply understand the influence of crack inclination angle on crack propagation and coalescence in fractured limestone, uniaxial compression tests were carried out on limestone specimens with prefabricated cracks. The strain field evolution diagram of the failure process of the specimens was obtained using 3D digital image correlation technology (3D-DIC technology). This, in combination with the crack propagation diagram, was used to analyze the entire failure process of the limestone specimens. The test results show that the evolution process of the principal strain field agrees well with

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27

Astapov, Nikolay S., and Vladimir D. Kurguzov. "Modeling of elasto-plastic fracture of a compact specimen." Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, no. 87 (2024): 44–58. http://dx.doi.org/10.17223/19988621/87/5.

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The strength of a compact specimen under normal fracture (fracture mode I) is studied within the framework of the Neuber-Novozhilov approach. A model of an ideal elasto-plastic material with limiting relative elongation is chosen as the model of the deformable solid. This class of materials includes low-alloy steels that are used in structures operating at temperatures below the cold brittleness threshold. The crack propagation criterion is formulated using the modified Leonov-Panasyuk-Dugdale model, which uses an additional parameter, i.e., the diameter of the plasticity zone (the width of th

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28

Angella and Zanardi. "Validation of a New Quality Assessment Procedure for Ductile Irons Production Based on Strain Hardening Analysis." Metals 9, no. 8 (2019): 837. http://dx.doi.org/10.3390/met9080837.

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A mathematical procedure based on the analysis of tensile flow curves has been proposed to assess the microstructure quality of several ductile irons (DIs). The procedure consists of a first diagram for the assessment of the ideal microstructure of DIs, that is, the matrix where mobile dislocations move, and a second diagram for the assessment of the casting integrity because of potential metallurgical discontinuities and defects in DIs. Both diagrams are based on the dislocation-density-related constitutive Voce equation that is used for modeling the tensile plastic behavior of DIs. The proce

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29

Gadenin, M. M. "Evolution of strains and damages at a cyclic elastoplastic deformation with dwells and superimposition on them additional pulsations of loading." Industrial laboratory. Diagnostics of materials 91, no. 5 (2025): 57–66. https://doi.org/10.26896/1028-6861-2025-91-5-57-66.

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It is noted that the major factor characterizing process of a cyclic elastoplastic loading is the diagram of a deformation in coordinates «stress – strain». The kinds of this diagram generally depends on the level of service stresses and strains, the mode and conditions of a loading, type of constructional material. At the same time one of fundamental problems of mechanics of a deformation and fracture which solution allows to carry out formation of the basic state equations, describing conditions of achievement of limit states on the basis of criteria of accumulation of damages, is the task a

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30

Ma, Seungchan, and Young Choi. "Study on the forming fracture of the crash box with extruded Al6060-T6 profile." Advances in Mechanical Engineering 15, no. 6 (2023): 168781322311659. http://dx.doi.org/10.1177/16878132231165903.

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This study was performed to analyze the forming fracture of crash box with extruded Al6060-T6 profile. Deep drawing test was performed to evaluate the formability of the extruded profile. For the various specimens, deep drawing tests were repeated to measure the maximum stroke at which fracture did not occur. The finite element analysis for the deep drawing tests was performed to calculate the principal strain through the obtained maximum stroke. The forming limit diagram for the design of the concave forming shape was calculated through the obtained principal strains with the FEA. The forming

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Mourad, Abdel-Hamid I. "Effect of Stress State on Mode II Stable Crack Extension." Key Engineering Materials 297-300 (November 2005): 1604–10. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.1604.

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The effect of assumption of plane state of stress on the predictability of experimental results observed during the mode II stable crack growth (SCG) through 8 mm thick compact tension specimens (CTS) of a workhardening aluminum alloy (D16AT) has been studied. Experimental results include load-sliding displacement diagram, extent of SCG, crack front geometry and fracture surface fractographs. The experimental results show that the crack extends in its own plane, the fracture surface is flat, smooth and free of any shear lip. The crack front geometry, which is straight initially, remains mostly

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Mensah, Desmond, Nicholas Pitkin, Michael P. Miles, David T. Fullwood, Marko Knezevic, and Brad Kinsey. "The Effect of Specimen Width on the Deformation Behavior and Formability of cp-Ti Grade 4 Sheets During Uniaxial and Cyclic Bending Under Tension Loading." Materials 17, no. 23 (2024): 5756. http://dx.doi.org/10.3390/ma17235756.

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This study examines the specimen size-dependent deformation behavior of commercially pure titanium grade 4 (cp-Ti grade 4) sheets under tension, with strain paths between uniaxial tension (UT) and plane-strain tension and compares the results with cyclic bending under tension (CBT) data. Specimens of varying widths (11.7, 20, 60, 100, and 140 mm) were tested in both rolling (RD) and transverse (TD) directions. The research employed digital image correlation for full-field strain measurements, finite element simulations, and fracture surface thickness data. Contrary to traditional forming conce

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33

Noh, Ingyu, Sangyeop Hong, and Jaehoon Kim. "Tensile Test Analysis of Tire Tread Rubber’s Tendency to Resist Cracks." Applied Sciences 12, no. 15 (2022): 7931. http://dx.doi.org/10.3390/app12157931.

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Among the various components of a tire, this study explores the tread portion, which has the longest contact with the ground during the summer, all-weather, and in the winter. The mechanical properties of three types of tread crack specimens were measured, and a stress–strain diagram for each specimen at low and high speeds was derived. Through the digital image correlation method, the crack tip opening displacement and angle were considered as fracture parameters and derived through equations. Subsequently, the different fracture progression regions were compared and analyzed to confirm the c

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34

Hirahara, Atsushi, Ryutaro Hino, and Fusahito Yoshida. "Forming Limit of Holed Dome in Two-Stage Stretch Forming." Advanced Materials Research 146-147 (October 2010): 844–47. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.844.

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This paper deals with the accurate prediction of forming limit of a dome with a circular hole in two-stage stretch forming. Since this two-stage forming is a process of non-proportional deformation, a fracture criterion, which is capable to predict fracture limit of sheet metal under non-proportional strain path, is introduced. The limit dome height of steel blank is predicted by utilizing numerical optimization technique, in which the fracture criterion is used as a constraint function to avoid sheet breakage. The calculated result and the corresponding experimental result show that the fract

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35

Quan, Guo-zheng, Gui-chang Luo, An Mao, Jian-ting Liang, and Dong-sen Wu. "Evaluation of Varying Ductile Fracture Criteria for 42CrMo Steel by Compressions at Different Temperatures and Strain Rates." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/579328.

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Fracturing by ductile damage occurs quite naturally in metal forming processes, and ductile fracture of strain-softening alloy, here 42CrMo steel, cannot be evaluated through simple procedures such as tension testing. Under these circumstances, it is very significant and economical to find a way to evaluate the ductile fracture criteria (DFC) and identify the relationships between damage evolution and deformation conditions. Under the guidance of the Cockcroft-Latham fracture criteria, an innovative approach involving hot compression tests, numerical simulations, and mathematic computations pr

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36

Liu, Hong Wei, Sheng Jie Yao, Wen Liang Liu, and Zhao Duo Zhang. "Forming Limit Diagram of Magnesium Alloy ZK60 at Elevated Temperature." Advanced Materials Research 308-310 (August 2011): 2442–45. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2442.

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The forming limit diagram of magnesium alloy ZK60 was developed with Hill’s instability criterion and M-K analysis. The relationship of forming limit with stain path, temperature and the thickness irregular coefficient were analyzed. The results show that the forming limit of ZK60 magnesium alloy increased little with the rising of strain ratio, but influenced greatly by the failure definition , and forming limit of is increased with the rising of temperature and thickness irregular coefficient, the most suitable value of f0 is 0.99, the fracture occur on the grain boundaries with significant

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37

Wang, Z. X., and R. Liu. "Elastic-Plastic Fracture Assessment for the Cracks Emanating from a Circular Hole under a Biaxial Loading Condition." Advanced Materials Research 602-604 (December 2012): 2241–44. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.2241.

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In this study, elastic-plastic stress and strain fields were analyzed on hole-edge cracks in an aluminum alloy plate under the biaxial load. And the effects of the load parallel to the crack face on failure parameters were discussed. By quantifying the effects of the crack size and the loading mode on the crack propagation driving force, J integral, and the plastic limit load, the corresponding failure assessment curves of the hole-edge cracked plate were established with the new R6 failure assessment diagram (FAD) method. The result shows that the transverse load has a larger effect on the fa

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Urbahs, Alexander, Mukharbiy Banov, Vladislav Turko, and Kristine Tsaryova. "The Characteristic Features of Composite Materials Specimen’s Static Fracture Investigated by the Acoustic Emission Method." Applied Mechanics and Materials 232 (November 2012): 28–32. http://dx.doi.org/10.4028/www.scientific.net/amm.232.28.

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The work is dedicated to the experimental study of micromechanics process of unidirectional composite materials’ specimens under static loading till its fracture using acoustic emission method compared with the strain-load deformation curve. An attempt is made to identify subtle effects of the failure process of the composite material which is impossible using the traditional methods of the strain measurement. The prospect of applying the method of acoustic emission (AE) for the development and improvement of existing methods of model tense- analysis is shown. The characteristic stages of the

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Cao, Jun, Fuguo Li, Weifeng Ma, et al. "A Strain Rate Dependent Fracture Model of 7050 Aluminum Alloy." Metals 10, no. 1 (2019): 3. http://dx.doi.org/10.3390/met10010003.

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The purpose of this research is to predict fracture loci and fracture forming limit diagrams (FFLDs) considering strain rate for aluminum alloy 7050-T7451. A fracture model coupled Johnson-Cook plasticity model was proposed to investigate its strain rate effect. Furthermore, a hybrid experimental-numerical method was carried out to verify the strain rate-dependent fracture model by using fracture points of uniaxial tension, notched tension, flat-grooved tension, and pure shear specimens. The results show that the fracture points are in accordance with the fracture loci and FFLDs under differen

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Kurguzov, V. D., and N. S. Astapov. "Analytical Model of Quasi-Brittle Fracture of a Plate with Crack." Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, no. 1 (144) (March 2023): 80–96. http://dx.doi.org/10.18698/0236-3941-2023-1-80-96.

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The paper considers a rectangular plate with the edge crack of mode I of normal separation from the elastoplastic material with the ultimate strain. This class of materials includes, for example, the low-alloy steels used in structures operating at temperatures below the cold brittleness threshold. The strength of the plate was studied within the framework of the Neuber --- Novozhilov approach. The crack propagation criterion was formulated using the modified Leonov --- Panasyuk --- Dugdale model using an additional parameter, i.e., the plasticity zone diameter (pre-fracture zone width). Under

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Alexandrov, S., M. Vilotic, Y. R. Jeng, and M. Plancak. "A Study on Material Workability by Upsetting of Non-Axisymmetric Specimens by Flat Dies." Journal of Mechanics 30, no. 6 (2014): 585–92. http://dx.doi.org/10.1017/jmech.2014.67.

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AbstractUpsetting is a typical test for determining the workability diagram. In most cases axisymmetric samples are used for such tests. However, the shape of samples may have a significant effect on the ductile fracture initiation. Therefore, a greater variety of sample geometry should lead to a more accurate shape of the workability diagram. A difficulty here is that a theoretical treatment of samples in which three-dimensional flow occurs is more difficult and time consuming as compared to axisymmetric samples under axisymmetric loading. This difficulty can be overcome in the case of the du

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Cui, Hongjian, Di Li, Qiutao Fu, Zipeng Lu, Jiachuan Xu, and Ning Jiang. "Research on Forming Limit Stress Diagram of Advanced High Strength Dual-Phase Steel Sheets." Materials 16, no. 13 (2023): 4543. http://dx.doi.org/10.3390/ma16134543.

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The Forming Limit Stress Diagram (FLSD) can accurately describe the forming process of high-strength steel. However, obtaining FLSD is relatively difficult. In order to predict fracture in advanced high-strength dual-phase (DP) steels, limit maximum and limit minimum principal strains of sheet were obtained through multiple sets of test and simulation. Two material parameters, strength coefficient K and hardening exponent n are introduced into the FLSD function which is established by the strain-stress transformation function. The function shows that the k-value determines the value of the max

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SLAITAS, Justas, Zbynek HLAVAC, and Arnoldas ŠNEIDERIS. "FLEXURAL REINFORCED CONCRETE ELEMENTS NORMAL SECTION BEARING CAPACITY EVALUATION IN FRACTURE STAGE." Engineering Structures and Technologies 9, no. 2 (2017): 70–78. http://dx.doi.org/10.3846/2029882x.2017.1322919.

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This article examines flexural reinforced concrete structures condition assessment process in existing buildings on the stage where the reinforcement stress is between the yield and the tensile strength. The research is made on V. Jokūbaitis proposed methodology directly measuring the compression zone height, allowing us to evaluate the behavior of reinforced concrete beam fracture sufficiently precisely. This paper confirms the hypothesis that, when reinforcement reaches yielding stress, elastic strain dominates in concrete‘s compression zone and it is reasonable to use triangular concrete co

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Rosa-Sainz, Ana, Gabriel Centeno Báez, Maria Beatriz Silva, and Carpoforo Vallellano. "On the Assessment of the Failure Strains in Conventional and Incremental Forming of Polymer Sheets." Key Engineering Materials 957 (October 2, 2023): 41–50. http://dx.doi.org/10.4028/p-1ljoln.

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This article presents an experimental research carried out on polymer sheet deformed by conventional forming, i.e. tensile and Nakajima tests, as well as by single point incremental forming (SPIF). The analysis is performed for polycarbonate (PC) polymer sheet material within the framework developed in previous recent papers of the authors, which the aim of defining a complete testing methodology for assessing formability and failure by necking and fracture of polymeric sheets. In the case of SPIF, truncated pyramid and cone test geometries are selected, enabling a variety of strain states fro

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Ota, Tomoyuki, and Takashi Iizuka. "Fundamental Investigation for Tensile Test Using Conical Cupping Die." Key Engineering Materials 622-623 (September 2014): 292–99. http://dx.doi.org/10.4028/www.scientific.net/kem.622-623.292.

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A number of researches have conducted in order to evaluate the ductile fracture occurrence by using forming limit diagram. However, specimen shape and testing machine for obtaining forming limit diagram of sheet metal have some problems. The problem about specimen shape is occurring at the specimen edge. In uniaxial tensile test, the specimen edge may cause a defused neck in width direction and may have influence on fracture occurrence. In biaxial tensile test by using a cruciform specimen, a uniform biaxial deformation is not obtained because uniaxial tensile stress occurs at the specimen edg

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Hojny, M., D. Woźniak, M. Głowacki, K. Żaba, M. Nowosielski, and M. Kwiatkowski. "Analysis Of Die Design For The Stamping Of A Bathtub." Archives of Metallurgy and Materials 60, no. 2 (2015): 661–66. http://dx.doi.org/10.1515/amm-2015-0189.

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Abstract The paper presents example results of numerical and photogrammetric analysis leading to identify the causes of cracking and wrinkling during bathtub W1200 production. The verification of tools for the stamping of bathtub W1200 was performed using finite element method and photogrammetric system ATOS Triple Scan. A series of industrial tests was conducted to identify the model parameters. The major and minor strain distributions obtained from the finite element simulations were used in conjunction with the forming limit diagram to predict the onset of fracture. In addition, the effects

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Aranđelović, Mihajlo, Simon Sedmak, Radomir Jovičić, et al. "Numerical and Experimental Investigations of Fracture Behaviour of Welded Joints with Multiple Defects." Materials 14, no. 17 (2021): 4832. http://dx.doi.org/10.3390/ma14174832.

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Current standards related to welded joint defects (EN ISO 5817) only consider individual cases (i.e., single defect in a welded joint). The question remains about the behaviour of a welded joint in the simultaneous presence of several different types of defects, so-called multiple defects, which is the topic of this research. The main focus is on defects most commonly encountered in practice, such as linear misalignments, undercuts, incomplete root penetration, and excess weld metal. The welding procedure used in this case was metal active gas welding, a common technique when it comes to weldi

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Xiao, G. F., Q. X. Xia, Y. Chang, and H. Y. Zhou. "Research on forming limit of Ni-based superalloy during spinning under complex strain path." IOP Conference Series: Materials Science and Engineering 1270, no. 1 (2022): 012049. http://dx.doi.org/10.1088/1757-899x/1270/1/012049.

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Ni-based superalloy components with complex shape, such as conical-cylindrical parts, are one of the most important structural components widely used in aviation and aerospace fields. Composite spinning process, consisting of shear spinning and deep drawing spinning, is the most effective method to manufacture this complex component. However, the fracture and wrinkling defects usually occur due to the severe work hardening and complex strain path. Therefore, in order to evaluate the forming limit of Ni-based superalloy during spinning under complex strain path at room temperature, the finite e

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Xu, Xuan, Li-Yuan Chi, Jun Yang, and Qi Yu. "Experimental Study on the Temporal and Morphological Characteristics of Dynamic Tensile Fractures in Igneous Rocks." Applied Sciences 11, no. 23 (2021): 11230. http://dx.doi.org/10.3390/app112311230.

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In order to investigate the temporal and morphological characteristics of dynamic tensile fractures, experiments on Brazilian specimens machined from igneous rocks (Breccia and Andesite) are carried out with the split Hopkinson pressure bar (SHPB). Detailed observation of the fracture processes of the Brazilian specimens is captured by high-speed camera at a frame rate of 100,000 frames per second. The rate-dependent effect of the dynamic tensile strength of the two igneous rocks is fitted and predicted by the incubation time criterion. Digital image correlation (DIC) is used to calculate the

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Kurmavina, S. O., and I. V. Tsatsulin. "Geometric Hypothesis for Normal Sections of Flexural and Eccentrically Compressed Reinforced Concrete Members." Building and Reconstruction, no. 2 (May 13, 2025): 33–43. https://doi.org/10.33979/2073-7416-2025-118-2-33-43.

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Experimental and numerical studies of the influence of plastic deformations of reinforcement on the stress-strain state of normal sections of bent reinforced concrete elements have been carried out. The results of investigations have shown that there is a fracture in the strain diagram in the zone of the neutral axis. A bilinear approximation of strain distribution along the section height is proposed. Based on the results of finite element model calculations, the parameter characterizing the ratio of compression and tension strains is estimated. Comparison with the analogous experimental depe

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