Effects of texture evolutions and point defects on ultrasonic waves under simple shear and pure shear

Abstract

In this paper, longitudinal and transverse wave velocities propagating into aluminum alloy A6061 under simple shear and pure shear were studied experimentally. Compared with the same velocity change tendencies of transverse wave under simple shear and pure shear, longitudinal wave velocity shows different change tendencies under both shear states, regardless of the same shear strain states in two cases. Finite element analysis was performed and the analyzed results indicate that the transverse wave velocity depends on texture evolutions mainly, whereas the longitudinal wave velocity is sensitively influenced by point defects induced by cross-slips. Consequently, the longitudinal wave velocity showing a sensitive response to the point defects was examined by measuring longitudinal wave velocity changes propagating into Al single crystal subjected to the combination loads of equi-biaxial tension and compression.

Formation of the third bodies of steel sliding against brass under lubricated conditions

“…5(a)). As a result of the experiment, severe shear plastic deformation of grain causes and accumulates dislocations, which result in voids in PDZ [36,37]. As shown in Fig.…”

Insights into anisotropy development and weakening of ice from in situ P wave velocity monitoring during laboratory creep

“…In situ real‐time ultrasonic velocity measurements have been used to monitor physical property evolution during brittle rock deformation experiments [ Ayling et al , ; Guillaume et al , ; Fortin et al , ; Stanchits et al , ; Fortin et al , ; Brantut et al , , ]. Experiments that make such measurements during high‐temperature ductile creep have only been achieved with metals [ Hirao et al , ; Tang et al , ] and never before with rock or ice samples.…”

A Concise Synthesis of the Naphthalene Portion of Purpuromycin

“…Purpuromycin 1,2 (1, Figure 1), a member of the rubromycin family of bisbenzannulated spiroketals, is a highly functionalized and oxygenated molecule. This group of natural products, (Figure 1) also includes the rubromycins, 3-8 griseorhodins, [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] and heliquinomycin, [28][29][30] and has attracted considerable attention due to their structural complexity and significant biological profiles. For example, antibacterial [31][32][33][34][35][36] and antifungal [31][32][33][34][35] properties have been reported leading to clinical use.…”