Comments on the tensile fracture mechanisms in copper

1977 ◽  
Vol 8 (4) ◽  
pp. 665-666
Author(s):  
Zdzisław Jasieński
Keyword(s):  
Tensile Fracture ◽  
Fracture Mechanisms

Fracture mechanisms of softwood under longitudinal tensile load at the cell wall scale

Holzforschung ◽  
2020 ◽  
Vol 74 (7) ◽  
pp. 715-724 ◽  
Author(s):  
Dong Wang ◽  
Lanying Lin ◽  
Feng Fu ◽  
Mizi Fan
Keyword(s):  
Cell Wall ◽  
Growth Ring ◽  
Middle Lamella ◽  
Tensile Load ◽  
Initial Crack ◽  
Tensile Fracture ◽  
Fracture Mechanisms ◽  
Wood Grain ◽  
Fracture Types ◽  
Transverse Strains

AbstractThis study was undertaken to elucidate the longitudinal tensile fracture behaviors of softwood at the cell wall scale by means of microscopic analyses. The fracture types of the tracheids at the different fracture surfaces were also distinguished. The results indicated that the main tracheid fracture of the earlywood (EW) sample was transverse transwall breakage. The tracheid fracture process of the transverse transwall breakage was initiated as a fracture in the S2 layer, with the crack propagating into the S1/S2 interface. For the EW/latewood (LW) sample, the strain concentration and initial crack under longitudinal tensile load generally occurred in wood rays in the EW part, which caused the tracheids to experience transverse transwall breakage. The differences in longitudinal and transverse strains between EW and LW under longitudinal tensile load led to shear stress and parallel-to-grain cracks occurring at the growth ring border. When the crack propagated along the wood grain in the EW tissue or growth ring boundary, this resulted in EW longitudinal transwall breakage. However, when the crack propagates along the wood grain in the LW tissue, it could cause the LW tracheid to undergo intrawall breakage, with the crack occurring predominantly at the compound middle lamella (CML)/S1 interface region.

scholarly journals Tensile Fracture Mechanism of Masonry Wallettes Parallel to Bed Joints: A Stochastic Discontinuum Analysis

Modelling ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 78-93
Author(s):  
Bora Pulatsu ◽  
Semih Gonen ◽  
Ece Erdogmus ◽  
Paulo B. Lourenço ◽  
Jose V. Lemos ◽  
...  
Keyword(s):  
Material Properties ◽  
Fracture Mechanism ◽  
Equations Of Motion ◽  
Constitutive Models ◽  
Numerical Approach ◽  
Tensile Fracture ◽  
Fracture Mechanisms ◽  
Contact Points ◽  
Statistical Variations ◽  
Modeling Strategy

Nonhomogeneous material characteristics of masonry lead to complex fracture mechanisms, which require substantial analysis regarding the influence of masonry constituents. In this context, this study presents a discontinuum modeling strategy, based on the discrete element method, developed to investigate the tensile fracture mechanism of masonry wallettes parallel to the bed joints considering the inherent variation in the material properties. The applied numerical approach utilizes polyhedral blocks to represent masonry and integrate the equations of motion explicitly to compute nodal velocities for each block in the system. The mechanical interaction between the adjacent blocks is computed at the active contact points, where the contact stresses are calculated and updated based on the implemented contact constitutive models. In this research, different fracture mechanisms of masonry wallettes under tension are explored developing at the unit–mortar interface and/or within the units. The contact properties are determined based on certain statistical variations. Emphasis is given to the influence of the material properties on the fracture mechanism and capacity of the masonry assemblages. The results of the analysis reveal and quantify the importance of the contact properties for unit and unit–mortar interfaces (e.g., tensile strength, cohesion, and friction coefficient) in terms of capacity and corresponding fracture mechanism for masonry wallettes.

scholarly journals Study of Tensile Fracture Mechanisms of a Ni-base Superalloy Supercast 247A

2014 ◽  
Vol 5 ◽  
pp. 1090-1096 ◽  
Author(s):  
A. Lava Kumar ◽  
N. Bhargav Chaitanya ◽  
B. Shiva Kumar ◽  
Virinchi Sai Nath ◽  
P.K. Singh
Keyword(s):  
Tensile Fracture ◽  
Fracture Mechanisms ◽  
Base Superalloy

Mechanical Properties and Tensile Fracture Mechanisms of Fe-Mn-(Al, Si) TRIP/TWIP Steels with Different Ferrite Volume Fractions

2015 ◽  
Vol 17 (11) ◽  
pp. 1675-1682 ◽  
Author(s):  
Fu Yuan Dong ◽  
Jian Chao Pang ◽  
Peng Zhang ◽  
Qi Qiang Duan ◽  
Zhe Feng Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Fracture ◽  
Fracture Mechanisms ◽  
Volume Fractions ◽  
Twip Steels

scholarly journals On the tensile fracture behavior of Cr coating for ATF cladding considering the effect of pre-oxidation

2021 ◽  
Vol 2076 (1) ◽  
pp. 012047
Author(s):  
Ziyan Pan ◽  
Mingduo Yuan ◽  
Zhenyu Zou ◽  
Weijian Zhang ◽  
Mingyue Du ◽  
...  
Keyword(s):  
Interfacial Strength ◽  
Tensile Fracture ◽  
Fracture Mechanisms ◽  
Failure Behavior ◽  
Premature Failure ◽  
Interfacial Cracks ◽  
Micro Cracks ◽  
Coating Microstructure ◽  
Cr Coating

Abstract In this study, the fracture mechanisms of Cr-coated Zr4 alloy samples were studied by in-situ tensile testing with high-resolution observations. Both original sample and pre-oxidized sample were studied to study the effects of pre-oxidation on the cracking and failure behavior. For the Cr-coated Zr4 sample, with the increase of tensile strain, multiple surface cracks were dominant and less interfacial cracks were formed, indicating good interfacial strength of Cr coating. For the pre-oxidized samples, there was a thin oxide layer formed on the Cr coating surface, revealing improved oxidation resistance and protection effects. However, a brittle ZrCr2 diffusion layer was formed in the same while at the Cr/Zr4 interface underneath the Cr coating, which would lead to earlier micro-cracks formed under tensile stress and evidently degrade the interfacial strength. The findings in the study indicated the importance of optimizing coating microstructure in future study to avoid forming the above-mentioned brittle diffusion interlayer and the associated premature failure.

Study on High-Temperature Mechanical Properties of Low-Carbon Fe-Mn-Si-Al TWIP Steel

2017 ◽  
Vol 36 (5) ◽  
pp. 505-513 ◽  
Author(s):  
Shiqi Li ◽  
Jianhua Liu ◽  
Hongbo Liu ◽  
Changling Zhuang ◽  
Jian Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Brittle Fracture ◽  
Temperature Interval ◽  
Twip Steel ◽  
Tensile Fracture ◽  
Fracture Mechanisms ◽  
Low Carbon ◽  
Brittleness Temperature ◽  
High Temperature Mechanical Properties

AbstractThe high-temperature mechanical properties of twinning-induced plasticity (TWIP) steel with 0.05 % C, 25 % Mn, 3 % Al, 3 % Si have been investigated using the GLEEBLE 3500 machine. The result shows that the zero ductility temperature and the zero strength temperature of the TWIP steel are measured at 1,225 °C and 1,275 °C, respectively. The brittleness temperature interval I is from 1,200 °C to the melting point, and the brittleness temperature interval III is from 650 °C to 800 °C. The tensile fracture has been examined using the scanning electron microscope, optical microscope and electron backscatter diffraction to determine the fracture mechanisms. The result shows that the twin is not the main influencing factor of the high-temperature plasticity of TWIP steel. Instead, the degree of dynamic recrystallization determines its high-temperature plasticity. A small number of AlN particles are found near the fractures, but these particles are so coarse, therefore, have no influence on the brittle fracture, and ferrite transformation and work hardening are the main reasons that cause the brittle fracture.

Microstructure and mechanical properties of reinforced polyamide 12 composites prepared by laser additive manufacturing

2019 ◽  
Vol 25 (6) ◽  
pp. 1127-1134 ◽  
Author(s):  
Yanhui Liu ◽  
Lingjie Zhu ◽  
Lei Zhou ◽  
Yongjiu Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Selective Laser Sintering ◽  
Tensile Fracture ◽  
Fracture Mechanisms ◽  
Strengthening Effect ◽  
Content Type ◽  
Tensile Fracture Surface ◽  
Polyamide 12 ◽  
Microstructure And Mechanical Properties

Purpose This paper aims to explore the influence of the reinforcement included either glass beads (GBs) or carbon fiber (CF) on the reinforced polyamide 12 (PA12) composite samples prepared by selective laser sintering (SLS). Design/methodology/approach In this paper, the microstructure and mechanical properties are investigated, and the results are compared with those obtained for non-reinforced pure PA12 samples prepared by SLS. Findings The tensile fracture surface of the non-reinforced pure PA12 sample presents strong micro-deformation within the crack origination zone between the melted PA12 matrix and the un-melted PA12 particle cores. As a result, the pure PA12 sample exhibits the greatest maximum elongation. The maximum tensile strength is obtained for the CF reinforced sample because of the strengthening effect of CF and the relatively good bonding between CFs and the PA12 matrix. The minimum tensile strength is obtained for the GB reinforced PA12 sample because of the relatively weak bonding between GBs and the PA12 matrix. Originality/value These results demonstrate that the characteristics of the interfaces between the reinforcement and the PA12 matrix have an important influence on the fracture mechanisms and mechanical properties of PA12 composites fabricated by SLS.

Sign in / Sign up

Export Citation Format

Share Document