Creep strain experiments on uncemented reservoir sands suggest that the time-dependent component of deformation can be modeled using linear viscoelasticity theory. The standard approach to solving for the values of the appropriate model parameters is to fit creep strain data as a function of time. However, by writing the creep compliance function in terms of strain-rate rather than strain, it i...

conclusions the present study showed that heat stress had a negative effect on job satisfaction; also there were no significant effects on job stress and job performance. results the results showed that job satisfaction had a negative correlation with wbgt index (r = -0.42, p < 0.001) and hssi (r = -0.49, p < 0.001). also, there was no statistical correlation among occupational stress and job p...

OBJECTIVE To examine the relationship between job strain and two indicators of mental health, depression and alcohol misuse, among currently employed older adults. METHOD Data come from the 2004 and 2006 waves of the Health and Retirement Study (N = 2,902). Multivariable logistic regression modeling was used to determine the association between job strain, indicated by the imbalance of job st...

In this study, the hot deformation processing map of AISI 304 austenitic stainless steel in two initial grain sizes of 15 and 40 μm was investigated. For this purpose, cylindrical samples were used in the hot compression test at the temperature range of 950-1100 °C and the strain rate of 0.005-0.5% s-1. At first, the relationship between the peak stress and Zener-Hollomon parameter w...

Lightweight aggregate is commonly used to reduce the self-weight of concrete elements which can efficiently mitigate environmental impact. This study investigates mechanical performance normal weight (NWAC) and (LWAC) exposed high temperature, focusing on developing a predictive model for stress-strain relationship LWAC based property cement, silica fume, light water/cement ratio. Mechanical pr...

Pregnancy-associated increases in uterine artery (UA) blood flow are due, in part, to vasoactive and growth-related changes that enlarge UA diameter. Although active and passive mechanical factors can contribute to this enlargement, their role is less well understood. We hypothesized that pregnancy increased UA distensibility and/or decreased myogenic tone. Given the fetal growth restriction an...

THE STRESS CONCEPT 454 Overview of Conceptualizations of Stress 454 Stressors 454 Stress Reactions 456 THEORIES ON ORGANIZATIONAL STRESS 457 Theoretical Models Focusing on the Stress Process 457 Theoretical Models on the Relationship Between Stressful Situations and Strains 458 EMPIRICAL EVIDENCE 460 Main Effects of Stressful Situations on Individual Well-Being and Health 460 The Role of Resour...

In the analysis of material thermal coupling effect, stress-strain relationship is seldom considered, which leads to greater influence grid strain poor accuracy effect analysis. Based on this, this paper puts forward geotechnical engineering reinforcement materials based finite element According concept cooling zone, resistance value calculated. Combined with stress and value, analyzed by discr...

The mechanical behavior of aluminum hexagonal honeycombs subjected to out-of-plane dynamic indentation and compression loads has been investigated numerically using ANSYS/LS-DYNA in this paper. The finite element (FE) models have been verified by previous experimental results in terms of deformation pattern, stress-strain curve, and energy dissipation. The verified FE models have then been used...

The stress–strain response of Co–Ni–Al with a two-phase microstructure displayed an unusual decrease in critical stress (84%) with strain or thermal cycling accompanied with an improved recoverability of pseudoelastic and shape memory strains. The pronounced decrease in critical stress occurred over a wide temperature range (145 C), and is linked to the interaction of the transformation front w...