Recent laboratory investigations conducted on soils prone to mud pumping have shown that the subgrade soil experiences softening associated with an internal redistribution of moisture when cyclic stress ratio (CSR) exceeds a certain critical level. This article aims evaluate stiffness degradation these problematic subjected wide range loading conditions. The test results revealed instability sp...

finite affine groups are given by groups of translations and di-lations on finite cyclic groups. for cyclic groups of prime orderwe develop a time-scale (wavelet) analysis and show that for alarge class of non-zero window signals/vectors, the generatedfull cyclic wavelet system constitutes a frame whose canonicaldual is a cyclic wavelet frame.

Total strain-controlled low-cycle-fatigue tests with and without hold times were performed at temperatures ranging from 816°C to 982°C in a laboratory air on a nickel-based superalloy, HASTELLOY X. The influence of hold times on the cyclicstress response and fatigue life was studied. At the temperatures considered, the alloy exhibited initial cyclic hardening, followed by a saturated cyclic-str...

This work investigates the defects (pore and lack of fusion), microstructure, fatigue properties Sc Zr-modified Al–Mg alloy on different building directions fabricated by laser powder bed fusion (LPBF). The results showed that transversely deposited (TD) samples exhibited a superior strength (100.5 MPa) compared to (57 parallelly (PD) sample, while their tensile hardness were similar. phenomeno...

The influence of pre-strain on the tensile and fatigue properties a dual phase DP600 steel was studied. material pre-strained by uni-axial tension in rolling transverse direction. Thereafter, specimens were cut from deformed plates parallel or orthogonal to It found that increases yield strength. Results suggested strain path change primarily affects elastic-plastic transition during early stag...

High-temperature fatigue tests are carried out to investigate the crack initiation behavior of ferrite–pearlite steel. Two approaches modeling under high temperatures in steel developed and compared this study. In first approach, basal energy is introduced as criterion for initiation. Various initial values assigned each potential location. The increments after cycle can be calculated. second a...

T he first programmable computers were rather nasty beasts. These giant 1940s machines occupied entire rooms and consumed kilowatts of electricity. The computation problems engineers faced more often involved failed machine hardware components than the short and mostly unchanging programs engineers fed to those machines. Engineers viewed computers and their programs as unified entities. Over th...

Nowadays, the technology intends to use materials such as magnesium alloys due to their high strength to weight ratio in engine components. As usual, engine cylinder heads and blocks has made of various types of cast irons and aluminum alloys. However, magnesium alloys has physical and mechanical properties near to aluminum alloys and reduce the weight up to 40 percents. In this article, a new ...

Fatigue failure usually occurs on the subsurface in rolling bearings due to multiaxial and non-proportional fatigue loadings between elements. One of main stress components is alternating shear stress. This paper focuses micromechanism plastic accumulation damage initiation bearing steels under cyclic deformation. The distribution was firstly investigated by finite element simulation. An atomic...