Engineering

Internal loops in superelastic shape memory alloy wires under torsion – Experiments and simulations/predictions
Understanding torsional responses of shape memory alloy (SMA) specimens under partial or fully transformed cases with internal loops is of particular importance as the entire response might not be always utilized and only a portion of the entire response (internal loop) might be of significance to designers. In this work, we present experimental results of large complex loading and unloading to...


Mechanics of inhomogeneous large deformation of photo-thermal sensitive hydrogels
A polymer network can imbibe copious amounts of solvent and swell, the resulting state is known as a gel. Depending on its constituents, a gel is able to deform under the influence of various external stimuli, such as temperature, pH-value and light. In this work, we investigate the photo-thermal mechanics of deformation of temperature sensitive hydrogels impregnated with light-absorbing nano-p...
Dispersion and localisation in structured Rayleigh beams
This paper brings a comparative analysis between dynamic models of couple-stress elastic materials and structured Rayleigh beams on a Winkler foundation. Although physical phenomena have different physical origins, the underlying equations appear to be similar, and hence mathematical models have a lot in common. In the present work, our main focus is on the analysis of dispersive waves, band-ga...


A smoothed inverse eigenstrain method for reconstruction of the regularized residual fields
A smoothed inverse eigenstrain method is developed for reconstruction of residual field from limited strain measurements. a framework for appropriate choice of shape functions based on the prior knowledge of expected residual distribution is presented which results in stabilized numerical behavior. The analytical method is successfully applied to three case studies where residual stresses are i...
Energy release rates in rubber during dynamic crack propagation
The theoretical understanding of the fracture mechanics of rubber is not as well developed as for other engineering materials, such as metals. The present study is intended to further the understanding of the dissipative processes that take place in rubber in the vicinity of a propagating crack tip. This dissipation contributes significantly to the total fracture toughness of the rubber and is ...


The effects of particle dynamics on the calculation of bulk stress in granular media
Expressions for bulk stress within a granular material in a dynamic setting are reviewed and explicitly derived for assemblies of three dimensional arbitrary shaped particles. By employing classical continuum and rigid body mechanics, the mean stress tensor for a single particle is separated into three distinct components; the familiar Love–Webber formula describing the direct effect of conta...
Modeling finite thickness slab perforation using a coupled Eulerian–Lagrangian approach
A coupled Eulerian–Lagrangian (CEL) method can be used to model many types of dynamic events. Projectile penetration through solids is particularly well-suited to a CEL method. In this study the CEL method in the commercially-available code abaqus was used to model a near rigid projectile perforating finite thickness concrete slabs. a near rigid projectile can be modeled as a Lagrangian mater...

Direction dependent orthotropic model for Mullins materials
The motivating key for this work was the absence of a phenomenological model that can reasonably predict a variety of non-proportional experimental data on the anisotropic Mullins effect for different types of rubber-like materials. Hence, in this paper, we propose a purely phenomenological direction dependent orthotropic model that can describe the anisotropic Mullins behaviour with permanent ...
Constitutive modeling of isotropic hyperelastic materials in an exponential framework using a self-contained approach
In this paper, an exponential framework for strain energy density functions of elastomers and soft biological tissues is proposed. Based on this framework and using a self-contained approach that is different from a guesswork or combination viewpoint, a set strain energy density functions in terms of the first and second strain invariants is rebuilt. Among the constructed options for strain ene...

Eringen’s length scale coefficient for buckling of nonlocal rectangular plates from microstructured beam-grid model
Based on a microstructured beam-grid model, closed form solutions for Eringen’s length scale coefficient are derived for the buckling of nonlocal rectangular plates under compressive uniaxial load. The microstructured beam-grid model comprises rigid beam elements connected by rotational springs and torsional springs. Stiffness of the rotational springs and torsional springs are expressed in t...
Prismatic tensegrity structures with additional cables: Integral symmetric states of self-stress and cable-controlled reconfiguration procedure
A simple energy method is put forward to determine the prestress distribution for symmetric tensegrity structures with multiple states of self-stress and a class of prismatic tensegrities with additional cables are introduced to show the accuracy of presented method. For the purpose of modifying structural shape as well as mechanical properties, a cable-controlled reconfiguration procedure is s...

A three dimensional approach to model steel wire ropes used in high energy absorber apparatus
The modeling method and dynamical characteristics of steel wire ropes has been researched for several decades. In the past, steel wire ropes were usually modeled as a two dimensional system, which was only suitable for the planar motion. Also, no kink-wave propagation was considered when steel wire ropes were used in relatively low speed engineering application areas. By contrast, a three dimen...
Rapid simulation procedure for fretting wear on the basis of the method of dimensionality reduction
We suggest a numerical procedure for rapid simulation of fretting wear in a contact of two bodies subjected to tangential oscillations with a small amplitude. The incremental wear in each point of contact area is calculated using the Reye–Archard–Khrushchov wear criterion. For applying this criterion, the distributions of pressure and relative displacements of bodies are required. These are...
Innovativeness, operations priorities and corporate performance: An analysis based on a taxonomy of innovativeness
The paper analyzes the relations among the manufacturing firm's innovativeness, operations priorities, and corporate performance. As opposed to common practice in the literature in which these relations are analyzed on a dichotomous (high vs. low) classification of innovativeness mostly based on product and/or process innovations, a taxonomy based approach is used here. Our findings demonstrate...
Applying complexity science to new product development: Modeling considerations, extensions, and implications
We extend the popular NK model of complex landscapes to incorporate two realities of NPD: (1) complementary vs. conflicting dependencies in a project and predominantly incremental design changes to components in evolutionary NPD projects. We show, through stylized projects that the nature of dependencies among system elements moderate the effect of system complexity. Our study highlights that N...