Study of Effects of Stress Concentration and Variation of Mechanical Properties

2020 ◽  
Vol 56 (15) ◽  
pp. 1511-1515
Author(s):  
N. A. Makhutov ◽  
V. V. Zatsarinnyy
Keyword(s):  
Mechanical Properties ◽  
Stress Concentration ◽  
Effects Of Stress

Effects of stress concentration on the mechanical properties of X70 in high-pressure hydrogen-containing gas mixtures

2020 ◽  
Vol 45 (52) ◽  
pp. 28204-28215 ◽  
Author(s):  
Juan Shang ◽  
Jinyang Zheng ◽  
Zhengli Hua ◽  
Yanhua Li ◽  
Chaohua Gu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Stress Concentration ◽  
Gas Mixtures ◽  
Effects Of Stress ◽  
Pressure Hydrogen

Simulation of Mechanical Properties of Aluminum Based on Micro Model

2013 ◽  
Vol 347-350 ◽  
pp. 1132-1138 ◽  
Author(s):  
Hai Dong Wang ◽  
Xu Liu ◽  
Gui Xue Bian ◽  
Li Xu ◽  
Shi Zhao
Keyword(s):  
Mechanical Properties ◽  
Stress Concentration ◽  
Elastic Constants ◽  
Driving Force ◽  
Metals And Alloys ◽  
Zone Model ◽  
Micro Model ◽  
Cohesion Zone ◽  
Metal Aluminum ◽  
Relationship Of

Elastic constants of purity and containing impurity metal aluminum were calculated, and the effects of impurity on the elastic constants were also studied. The effect of particle on micro-stress concentration and debonded stress of inclusion was researched. The mechanical relationship between the grains was defined by relationship of displacement and driving force in cohesion zone model (CZM).The method can be extended to research mechanical properties of other metals and alloys structures.

scholarly journals Effects of Interfacial Reactions on Microstructures and Mechanical Properties of 3003 Al/T2 Cu and 1035 Al/T2 Cu Brazed Joints

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 248
Author(s):  
Man Zhang
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Stress Concentration ◽  
Joint Strength ◽  
Interfacial Reactions ◽  
Composition Analysis ◽  
Dispersion Strengthening ◽  
Al Content ◽  
Brazed Joints ◽  
Filler Metals

To meet the demand for efficient and reliable copper and aluminum (Cu/Al) joints in refrigeration and electric power industries, interfacial reactions in 3003 Al/T2 Cu and 1035 Al/T2 Cu joints brazed by Zn-xAl (x ranged from 2–25 wt.%) filler metals and their effects on the mechanical properties of the joints were investigated. Microstructures and fracture surfaces were observed combining with composition analysis. For 3003 Al/Cu joints, bulk CuAl and CuAl2 intermetallic compound (IMC) formed in brazing seams, and a CuAl IMC layer formed at the Cu side interfaces. For 1035 Al/Cu joints, bulk CuAl2 IMC formed in brazing seams, and an Al4.2Cu3.2Zn0.7 IMC layer formed at the Cu side interfaces. For both kinds of joints, shear strength increased first, then decreased with the increasing Al content. The increase in shear strength was because Al promoted the formation of Cu-Al IMC, and caused dispersion strengthening. With the excessive Al content, however, the bulk IMC became coarse and the IMC layers at Cu side interfaces grew thick, causing the joint strength to decrease due to stress concentration. The strength of 3003 Al/Cu joints was always higher than that of 1035 Al/Cu, and their highest strength were achieved by Zn-12Al and Zn-15Al, respectively.

Effect of Grain Refinement on Mechanical Properties in 25Cr-1N Austenitic Steel

2010 ◽  
Vol 638-642 ◽  
pp. 3549-3554 ◽  
Author(s):  
Toshihiro Tsuchiyama ◽  
T. Onomoto ◽  
K. Tsuboi ◽  
Setsuo Takaki
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Stress Concentration ◽  
Grain Refinement ◽  
Intergranular Fracture ◽  
Tensile Deformation ◽  
Austenitic Steels ◽  
High Yield ◽  
Structure Characteristic ◽  
Step Heat Treatment

The Fe-25Cr-1N alloy produced by solution nitriding possesses extremely high yield strength owing to the solid solution strengthening by nitrogen. However, it was found that the steel exhibited an insufficient elongation because of the brittle intergranular fracture caused during the uniform tensile deformation. This is due to the marked stress concentration at grain boundaries, which is derived from the grain coarsening caused during long time solution nitriding and the development of planar dislocation structure characteristic of high nitrogen austenitic steels. The most effective way to reduce the stress concentration at grain boundary during deformation should be grain refinement. In this study, grain refinement was attempted by the two-step heat treatment for the Fe-25Cr-1N(-Mn) alloy, and then the mechanical properties were investigated by means of tensile tests and fatigue tests. The two-step heat treatment resulted in the grain refinement of austenite to 20 microns in diameter. The intergranular fracture was greatly suppressed from 70% (as-solution-nitrided) to 10% (grain-refined) in area fraction by the grain refinement. In addition, elongation was markedly increased with local necking. The yield stress and tensile strength were also increased, and thus, the fatigue limit is also raised by more than 30%.

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