scholarly journals The role of microstructure and strain rate on the mechanical behavior of Ti-6Al-4V produced by powder metallurgy

2020 ◽  
Vol 92 ◽  
pp. 105268 ◽  
Author(s):  
James D. Paramore ◽  
Brady G. Butler ◽  
Matthew K. Dunstan ◽  
Hongjoo Rhee ◽  
Haitham El Kadiri ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Strain Rate ◽  
Mechanical Behavior

Influence of strain rate on the mechanical behavior of cortical bone interstitial lamellae at the micrometer scale

2006 ◽  
Vol 21 (8) ◽  
pp. 2093-2097 ◽  
Author(s):  
Maximilien Vanleene ◽  
Pierre-Emmanuel Mazeran ◽  
Marie-Christine Ho Ba Tho
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Mechanical Behavior ◽  
Bone Matrix ◽  
Femur Bone ◽  
Structure Assessment ◽  
Continuous Stiffness Measurement ◽  
Micrometer Scale

Investigations of bone mechanical properties are of major importance for bone pathology research, biomaterials, and development of in vivo bone characterization devices. Because of its complex multiscale structure, assessment of bone microstructure is an important step for understanding its mechanical behavior. In this study, we have investigated the strain rate influence on the mechanical properties of interstitial lamellae on two human femur bone samples. Nanoindentation tests were performed with the continuous stiffness measurement technique. Young's modulus and hardness were calculated using the Oliver and Pharr method. A statistical significant influence of strain rate on hardness was found (p < 0.05) showing a viscoplastic behavior of interstitial bone at the micrometer scale. This phenomenon may reflect the role of the organic component in the bone matrix mechanical behavior.

scholarly journals Role of tantalum concentration, processing temperature, and strain-rate on the mechanical behavior of copper-tantalum alloys

2021 ◽  
Vol 208 ◽  
pp. 116706
Author(s):  
S. Srinivasan ◽  
S. Sharma ◽  
S. Turnage ◽  
B.C. Hornbuckle ◽  
C. Kale ◽  
...  
Keyword(s):  
Strain Rate ◽  
Mechanical Behavior ◽  
Processing Temperature ◽  
Tantalum Concentration

scholarly journals Role of carbon and nitrogen in the improvement of corrosion resistance of new powder metallurgy Co-Cr-Mo alloys

2020 ◽  
Vol 38 (3) ◽  
pp. 273-286 ◽  
Author(s):  
Cristina Garcia-Cabezon ◽  
Celia Garcia-Hernandez ◽  
Maria L. Rodriguez-Mendez ◽  
Gemma Herranz ◽  
Fernando Martin-Pedrosa
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
Nitrogen Content ◽  
Powder Metallurgy Technique ◽  
Carbon And Nitrogen ◽  
Physiological Conditions ◽  
Carbon And Nitrogen Content ◽  
Astm F75

AbstractMicrostructural changes that result in relevant improvements in mechanical properties and electrochemical behavior can be induced using different sintering conditions of ASTM F75 cobalt alloys during their processing using powder metallurgy technique. It has been observed that the increase in carbon and nitrogen content improves corrosion resistance and mechanical properties as long as the precipitation of carbides and nitrides is avoided, thanks to the use of rapid cooling in water after the sintering stage. In addition, the reduction of the particle size of the powder improves hardness and resistance to corrosion in both acid medium with chlorides and phosphate-buffered medium that simulates the physiological conditions for its use as a biomaterial. These results lead to increased knowledge of the role of carbon and nitrogen content in the behavior displayed by the different alloys studied.

Solder Creep-Fatigue Interactions With Flexible Leaded Parts

1992 ◽  
Vol 114 (2) ◽  
pp. 185-192 ◽  
Author(s):  
R. G. Ross ◽  
L. C. Wen ◽  
G. R. Mon ◽  
E. Jetter
Keyword(s):  
Computer Program ◽  
Strain Rate ◽  
Thermal Cycle ◽  
Failure Process ◽  
Strain Range ◽  
Strain Rate Effects ◽  
Rate Effects ◽  
Creep Fatigue ◽  
Solder Fatigue

With flexible leaded parts, the solder-joint failure process involves a complex interplay of creep and fatigue mechanisms. To better understand the role of creep in typical multi-hour cyclic loading conditions, a specialized non-linear finite-element creep simulation computer program has been formulated. The numerical algorithm includes the complete part-lead-solder-PWB system, accounting for strain-rate dependence of creep on applied stress and temperature, and the role of the part-lead dimensions and flexibility that determine the total creep deflection (solder strain range) during stress relaxation. The computer program has been used to explore the effects of various solder creep-fatigue parameters such as lead height and stiffness, thermal-cycle test profile, and part/board differential thermal expansion properties. One of the most interesting findings is the strong presence of unidirectional creep-ratcheting that occurs during thermal cycling due to temperature dominated strain-rate effects. To corroborate the solder fatigue model predictions, a number of carefully controlled thermal-cycle tests have been conducted using special bimetallic test boards.

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