Abstract The influence of pre-strain on the very-low-cycle loading behavior as occurring, for example during roller leveling sheet metals, is not yet fully understood. A key factor in this context stiffness material and its changes upon processing. To study general mechanical property low-cycle with small amplitudes a wide variety samples mild steel DC01, pure copper CU-DHP α -titanium are subj...

Abstract The uniaxial tensile test investigated the fatigue performance of DP780 steel without pre-strain and with 5% 10% pre-strain. Topography fractured surfaces was observed to study relationship between performance. results showed that specimens would affect steel. It cause an increase in life when stress comparatively high less than 100,000 cycles. However, reduced level low, more Pre-stra...

Plastic pre-strains were applied to the metastable 304L austenitic stainless steel at both room temperature (20 °C) and higher temperatures (i.e., 50, 80 and 100 °C), and then the hydrogen embrittlement (HE) susceptibility of the steel was evaluated by cathodically hydrogen-charging and tensile testing. The 20 °C pre-strain greatly strengthened the steel, but simultaneously significantly increa...

Research on pre-deformation influences material properties in multistep hot forming is of important scientific interest. In this paper, tensile tests at 850 °C and a strain rate 0.001 s−1 were performed to study the microstructural evolution mechanical Ti-6Al-4V with pre-strains 0.05, 0.1 0.15. The test results showed that specimen 0.05 pre-strain exhibited higher flow stress larger elongation....

During design and winding of superconducting magnets at room temperature, a pre-tension under different rate is always applied to improve the mechanical stability of the magnets. However, an inconsistency rises for superconductors usually being sensitive to strain and oversized pre-stress which results in degradation of the superconducting composites' critical performance at low temperature. Th...

Residual stresses in fibre reinforced composites can give rise to a number of undesired effects such as loss of dimensional stability and premature fracture. Hence, there is significant merit in developing processing techniques to mitigate the development of residual stresses. However, tracking and quantifying the development of these fabrication-induced stresses in real-time using conventional...

This study quantified the apparent and intrinsic hydraulic permeability of human medial collateral ligament (MCL) under direct permeation transverse to the collagen fiber direction. A custom permeation device was built to apply flow across cylindrical samples of ligament while monitoring the resulting pressure gradient. MCLs from 5 unpaired human knees were used (donor age 55 +/- 16 yr, 4 males...