Dynamic response and failure mechanism of Ti-6AL-4V hi-lock bolts under combined tensile-shear loading

2019 ◽  
Vol 131 ◽  
pp. 140-151 ◽  
Author(s):  
Xiaochuan Liu ◽  
Xulong Xi ◽  
Chunyu Bai ◽  
Jialing Yang ◽  
Xianfeng Yang
Keyword(s):  
Dynamic Response ◽  
Failure Mechanism ◽  
Shear Loading ◽  
Tensile Shear

Ultimate Strength and Failure Mechanism of Resistance Spot Weld Subjected to Tensile, Shear, or Combined Tensile/Shear Loads

2003 ◽  
Vol 125 (2) ◽  
pp. 125-132 ◽  
Author(s):  
Yuh J. Chao
Keyword(s):  
Failure Mechanism ◽  
Shear Loading ◽  
Tension Test ◽  
Spot Weld ◽  
Shear Mode ◽  
Structural Level ◽  
Tensile Shear ◽  
Lap Shear ◽  
Strength Tests ◽  
Cross Tension

Strength tests were performed to reveal the failure mechanisms of spot weld in lap-shear and cross tension test samples. It is shown the while the lap-shear (cross tension) sample is subjected to shear (normal) load at the structural level the failure mechanism at the spot weld is tensile (shear) mode at the materials level. Based on the observed failure mechanism, stress distribution is assumed and related to the far field load for the lap-shear and cross tension test samples. It appears that the failure load of the cross tension sample is 74 percent of the lap-shear sample based on the classical von Mises failure theory. The theoretical model is further extended to the mixed normal/shear loading condition. Data from strength tests as well as finite element numerical method are used to validate the model. Finally, the utility of the model in accessing the failure strength of spot welds is discussed.

scholarly journals DYNAMIC RESPONSE BEHAVIOR AND FAILURE MECHANISM OF SLOPES USING LARGE SHAKING TABLE

2017 ◽  
Vol 73 (1) ◽  
pp. 45-61
Author(s):  
Susumu NAKAJIMA ◽  
Masahiro SHINODA ◽  
Kenji WATANABE ◽  
Taisuke SANAGAWA ◽  
Keita ABE ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Failure Mechanism ◽  
Shaking Table ◽  
Response Behavior

Experimental study of nanoelectroplating steel spot welding structure under impact tensile-shear loading

2021 ◽  
Vol 11 (7) ◽  
pp. 1207-1213
Author(s):  
Chunlei Fan ◽  
Huanran Wang ◽  
Dongfang Ma
Keyword(s):  
Dynamic Loading ◽  
Heat Affected Zone ◽  
Static Loading ◽  
Spot Welding ◽  
Fracture Behavior ◽  
Shear Fracture ◽  
Base Material ◽  
Shear Loading ◽  
Tensile Shear ◽  
Softened Zone

The tensile shear fracture behavior of solder joints under impact load influences the whole vehicle’s safety substantially. This paper takes the QP980 steel resistance spot welding (RSW) structure as the research object to study the tensile-shear fracture behavior of the RSW structure under tensile-shear loading. The microstructure observation of the welded spot shows that the metallographic structure is the martensite. The porosity defects in the melting zone are the primary defect reflecting the obvious plate-cracks on both sides of the nugget. The paper demonstrates the Vickers hardness test result of the spot-welded zone. According to the test, the micro-hardness distribution result shows that the higher the martensite, the greater the hardness. A softened zone emerges adjacent to the heat-affected zone on the welded base material interface. The quasi-static and dynamic tensile-shear tests on the QP980 steel RSW lap-joint specimens show that the fracture on the BM is adjacent to the welded spot under quasi-static loading but close to the heat-affected zone under dynamic loading. Under dynamic loading, the weld seam and softened zone of the welded spot have a direct influence on the fracture. On the recovered specimen’s fractured section, there are a large number of apparent dimples on the section of the BM under quasi-static loading and the section of the HAZ under dynamic loading with nucleation, growth, and aggregation of cavitation, resulting in ductile fracture.

Microstructure and mechanical properties of 6061-T6 aluminum alloy and Q235 steel via probeless friction stir extrusion joining

2021 ◽  
Author(s):  
Peng Zhang ◽  
Shengdun Zhao ◽  
Chuanwei Zhang ◽  
Zheng Chen ◽  
Jiaying Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Composite Structures ◽  
Rotation Speed ◽  
Shear Loading ◽  
Tensile Shear ◽  
Q235 Steel ◽  
Friction Stir ◽  
Fracture Failure ◽  
Friction Stir Extrusion

Abstract Aluminum alloy and steel composite structures are increasingly and widely used in the automotive industry and other fields owing to their advantages of light weight and high comprehensive performance. The high-quality joining of aluminum alloy and steel has become the research focus in China and overseas. The current study proposes a probeless friction stir extrusion joining (P-FSEJ) process to avoid intermetallic compounds, reduce wear of tools, and obtain a spot joint without keyhole defects. Strong mechanical interlock is formed after that the plasticized aluminum alloy (AA) 6061-T6 is extruded into the prefabricated threaded hole of a Q235 steel plate in the P-FSEJ process. Three distinct zones in the typical symmetrical “basin-shaped” P-FSEJed joint are observed. In addition to the rotation speed, the diameter of the threaded hole is also specifically used to study the influence on the mechanical properties of the joint. When the rotation speed is 1200 rpm, the maximum tensile-shear loads of the M6 and M7 threaded hole joints are 2882.93 N and 3344.74 N, respectively, while the M8 threaded hole joint is 4139.58 N at rotation speed of 1000 rpm. Two typical fracture failure modes of the P-FSEJed joints, namely, rivet shear and rivet pullout-shear fractures, are obtained under tensile-shear loading. Lastly, the P-FSEJed joints with mode “P” fracture failure generally have high strength and energy absorption capability.

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