Significance The bottom-up assembly of deterministic structures by lattice cell for surpassing properties individual components or their sums orders magnitude is critical importance in materials design. Here, we present a theoretical strategy the search and design heterogeneously architected 2D (HASs) assembling arbitrarily shaped basic demonstrate that an extremely broad range mechanical can be achieved. This allows designing HASs through interface close relevance to patterns bonding...

An auxetic design is proposed by soft-hard material integration and demonstrate negative Poisson's ratio (NPR) can be achieved leveraging unique rotation features of non-connected hard particles in a soft matrix. A theoretical mechanics framework that describes matrix under mechanical loading incorporated with overall the integrated metamaterials. The analysis shows behaviour structures not only relies critically on geometry particles, but also depends their periodic arrangements Extensive...

In the present study, creep experiments at different stress and temperatures were carried out to study behavior of PMMA (MDYB-3). The results show that is significantly dependent on temperature in range 20–75°C. It was indicated duration curves could be divided into three phases. Chen theory, Norton formula exponential expression can used describe phases behaviors, respectively. Furthermore, constitutive model based experiment introduced implemented a user subroutine UMAT software ABAQUS....

In the present study, tensile tests and compressive at different loading rates temperatures were carried out to study mechanical behaviors of MDYB-3 systematically. The experimental results show that stress-strain behavior performance material under tension differ significantly from it response. failure strength, elastic modulus yield strength increase basically with rise temperature, while critical strain decreases temperature. Furthermore, a constitutive model was proposed for expressing...

Abstract Tests have been conducted to investigate the influence of temperature, stress, and crazing for polyethylene methacrylate ( PMMA ) creep life. Creep life decreases with stress in a logarithmic relation, rupture strains increase decreasing stress. To assess , Larson–Miller parameter is first introduced correlate temperature time. The important role polymer material damage, especially, craze density growth rate stable stage, demonstrated. initiation time related tensile strength at...

In the field of structural reliability, estimation failure probability often requires large numbers time-consuming performance function calls. It is a great challenge to keep number calls minimum extent. The aim this paper propose an approach assess reliability in efficient way. proposed method could be viewed as hybrid which combines advantages adaptive importance sampling, low-discrepancy sampling and artificial neural network. method, network introduced alleviate computational burden...

Abstract The vascular stents are important medical devices introduced into a vessel to protect the lumen from unfriendly stenosis. However, Nitinol stent is easy fail in practice. present paper focuses on influence of defects its mechanical behavior by finite element analysis. essential cell used with two different type defects, which includes face bulge defect resulted laser burrs or TiC inclusion arises and C‐contained particle voids. Auricchio’s super‐elastic consititutive equations...

Using the convex model approach, bounds of uncertain variables are only required rather than precise probability distributions, based on which it can be made possible to conduct reliability analysis for many complex engineering problems with limited information. This paper aims develop a novel nonprobabilistic solution method structures interval uncertainty variables. In order explore entire domain represented by variables, an enhanced optimal Latin hypercube sampling (EOLHS) is used reduce...

Purpose – A series of creep experiments were carried out to study a new criterion for residual life assessment PMMA (MDYB-10) with various stresses level at room temperature. macroscopical model based on abundant results was researched first. The included three phases which are described by the Chen theory, Norton formula and exponential expression, respectively. paper aims discuss these issues. Design/methodology/approach During experiments, simple optical testing instrument used observe...

In this work, a multi-field coupled finite element simulation method involving thermochemistry and mechanics was devised to predict the curing deformation (C-DE) of T-shaped stiffened panel (T-SSPL), typical aircraft structural component, during autoclave forming process. A more comprehensive detailed analysis factors affecting C-DE T-SSPL is also carried out. The methodology uses Fortran language write different user subroutines establish corresponding mathematical models simulate...

Using the convex model approach, bounds of uncertain variables are only required rather than precise probability distributions, based on which it can be made possible to conduct reliability analysis for many complex engineering problems with limited information. In this paper, three types including interval, ellipsoid, and multiellipsoid uncertainty investigated, a uniform nonprobabilistic is built. process, an effective space-filling design introduced generate representative samples space...

In this paper, based on orthogonal experiment, piccolo tube dynamic optimization was performed to achieve the purposes of reducing time sample, identifying key parameters and optimizing design. Firstly, parameterized finite element model built. After that, experiment under four design variables covering three levels performed. 10 times dynamics simulation analysis (9 for 1 optimal verification experiment), quickly determined. The first order natural frequency improved 1771HZ from initial...