Search results

Polyurethane concrete (PUC), as a new type of steel bridge deck paving material, the bond-slip pattern at the interface with the steel plate is not yet clear. In this study, the mechanical properties of the PUC and steel plate interface under the coupled action of temperature, normal force and tangential force were explored through shear tests and numerical simulations. An analytical model for bond-slip at the PUC/steel plate interface and a predictive model for the shear strength of the PUC/steel plate interface were developed.

The new shear test device designed in this paper overcomes the defect that the traditional oblique shear test cannot test the interface shear performance under the condition of fixed normal force. The universal testing machine (UTM) test machine was used to adjust the test temperature conditions. Combined with the results of the bond-slip test, the finite element simulation of the interface is completed by using the COHENSIVE unit to analyze the local stress distribution characteristics of the interface. The use of variance-based uncertainty analysis guaranteed the validity of the simulation.

The shear strength (τ_f) at the PUC-plate interface was negatively correlated with temperature while it was positively correlated with normal stress. The effect of temperature on the shear properties was more significant than that of normal stress. The slip corresponding to the maximum shear (D₁) positively correlates with both temperature and normal stress. The interfacial shear ductility improves with increasing temperature.

Based on the PUC bond-slip measured curves, the relationship between bond stress and slip at different stages was analyzed, and the bond-slip analytical model at different stages was established; the model was defined by key parameters such as elastic ultimate shear stress τ₀, peak stress τ_f and interface fracture energy G_f.

The purpose of this study is to develop an electromagnetic loading method for online measurement of the acoustoelastic coefficients and bus bar plane stress.

A method based on the combination of electromagnetic loading and the acoustoelastic effect is proposed to realize online measurement of acoustoelastic coefficients and plane stress. Electromagnetic loading is performed on the bus bar specimen, and the acoustoelastic coefficients and the bus bar plane stress are obtained by the ultrasonic method. An electromagnetic loading experimental platform is designed to provide electromagnetic force to the metal plate, including an electromagnetic loading module, an ultrasonic testing module and a stress simulation module.

The feasibility of the proposed electromagnetic loading method is proved by verification experiments. The acoustoelastic coefficients and plane stress measured using the electromagnetic loading method are more accurate than those measured using the traditional method.

The proposed electromagnetic loading method provides a new study perspective and enables more accurate measurement of the acoustoelastic coefficients and plane stress. The study provides an important basis for evaluating the operation status of electrical equipment.

The rock drill’s drill tail experiences high-frequency fretting simultaneously in the rotational and axial directions. Due to the complex working characteristics and the low viscosity of the water medium, the pure water seal is susceptible to damage and failure. The purpose of this paper is to enhance the water seal’s performance.

The Y-shaped seal ring is modeled and simulated using orthogonal testing. Through analysis of the impact of various seal section parameters on sealing performance, the maximum contact stress and maximum Von Mises stress are selected as indicators of sealing effectiveness.

The maximum contact stress is proportional to lip thickness and chamfer length but inversely proportional to lip length. Meanwhile, the maximum Von Mises stress is directly influenced by lip depth and the included angle of the lip and drill tail but is inversely proportional to the lip thickness. The enhanced Y-shaped water seal sees reductions of 15% and 45% in maximum contact stress and maximum Von Mises stress, respectively.

This paper used analytical method and model that is helpful for design of the water seal’s structure in complex working characteristics and the low viscosity of the water medium.

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2023-0366/

Presents evidence on the prevalence of work stress and the apparent reluctance of many to recognize the interdependence of individual and organizational health. Consequently focuses on the urgent need for organizations to engage in stress prevention and stress management activities. Previous approaches to stress prevention and stress management have often appeared to be rather haphazard, so outlines a practical, all encompassing, cost‐saving model which brings the organization towards a philosophy of “total stress management”.

This is the second of a two‐part article describing a characterisation of stress based on a stress continuum. Part 1 provided a holistic description of the full range of individuals′ startle reactions and stressed responses. Part 2 describes the emergence of stress characters, links these characters to the stressors that prompt them and the effects they produce, and considers the methodological implications of the frameworks for those wishing to help alleviate individuals′ stress. Overall, the article develops the original stress story towards one which matches, and beyond that serves to integrate and provide a rationale for, the full qualitative diversity of individuals′ stress.

When an aircraft changes its speed or altitude, large thermal strains may be set up in the wing structure; sometimes these are of sufficient magnitude for the accompanying stresses to exceed the clastic limit of the material. During its life the aircraft may suffer a large number of cycles of thermal stress. Under repeated thermal loading it is found that four types of stress‐strain system may be set up: permanent elasticity and shakedown to an clastic state, which are safe, and alternate plasticity and incremental collapse, which are dangerous. The present paper investigates these stress‐strain systems and determines the conditions for their occurrence.

Studies the effect of parameters controlling the biological growth method by applying it to the classical optimization problem of a plate with a central hole under biaxial stress state. It has been found that the optimization character of the method depends strongly on the so‐called reference stress. Depending on the magnitude of this parameter either a local or global optimum is approached. A global optimum corresponds to the minimum possible v. Mises stress along the hole boundary (and hence in the plate), whereas a local optimum presents the modified shape of the hole yielding an uniform stress distribution whose magnitude is larger than the minimum possible value and which is equal to the specified reference stress. The magnification factor applied to the iterative displacement results influences the optimization speed. Too large factors lead to divergence of the solution. Furthermore, it has been found that the dimension of the optimization domain has a critical effect on the optimization result.

This article acknowledges the need for managers to be more politically sensitive, due to social and organisational changes. The dual nature of the link between politics and stress is explored. First, the question of how political situations lead to stress is examined. In order to analyse the second link a model of political sensitivity and a model of stress are presented. This enables the effect of stress on the dimensions of political skill to be assessed. In conclusion, the implications of these links for management and organisation development are drawn.

Gives an overview of events in the field of stress management. Describes the relationship of stress to the human autonomic nervous system and discusses the physiological effects in relation to type A/B behaviour. Investigates the sources and methods of detection of stress. Examines methodologies for stress management, the design of stress management programmes for industry application, and the results which selected corporations have achieved. Reviews a critique of current stress management programmes available to industry.

To compare the experience of occupational stress across a large and diverse set of occupations. Three stress related variables (psychological well‐being, physical health and job satisfaction) are discussed and comparisons are made between 26 different occupations on each of these measures. The relationship between physical and psychological stress and job satisfaction at an occupational level is also explored.Design/methodology/approach – The measurement tool used is a short stress evaluation tool which provides information on a number of work related stressors and stress outcomes. Out of the full ASSET database 26 occupations were selected for inclusion in this paper.Findings – Six occupations are reporting worse than average scores on each of the factors – physical health, psychological well‐being and job satisfaction (ambulance workers, teachers, social services, customer services – call centres, prison officers and police). Differences across and within occupational groups, for example, teaching and policing, are detailed. The high emotional labour associated with the high stress jobs is discussed as a potential causal factor.Research limitations/implications – This is not an exhaustive list of occupations and only concerns employees working within the UK.Originality/value – There is little information available that shows the relative values of stress across different occupations, which would enable the direct comparison of stress levels. This paper reports the rank order of 26 different occupations on stress and job satisfaction levels.