Fundamentals of Residual Stresses in Joints Between Dissimilar Materials

Rabin, B. H.; Williamson, R.L.; Suresh, S.

doi:10.1557/s0883769400048910

Cited by 31 publications

(19 citation statements)

References 1 publication

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“…Failure often occurs at the interface of joined materials with high modulus mismatches [263,264]. This does not occur in the case of the byssal threads and is likely the result of modulus management in which the distal region softens and the proximal portion stiffens close to the interface.…”

Section: Mussel Byssusmentioning

confidence: 99%

Biological materials: Structure and mechanical properties

Meyers

Chen

Lin

et al. 2008

Progress in Materials Science

2,134

1,129

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Most natural (or biological) materials are complex composites whose mechanical properties are often outstanding, considering the weak constituents from which they are assembled. These complex structures, which have risen from hundreds of million years of evolution, are inspiring Materials Scientists in the design of novel materials.Their defining characteristics, hierarchy, multifunctionality, and self-healing capability, are illustrated. Self-organization is also a fundamental feature of many biological materials and the manner by which the structures are assembled from the molecular level up. The basic building blocks are described, starting with the 20 amino acids and proceeding to polypeptides, polysaccharides, and polypeptides-saccharides. These, on their turn, compose the basic proteins, which are the primary constituents of 'soft tissues' and are also present in most biominerals. There are over 1000 proteins, and we describe only the principal ones, with emphasis on collagen, chitin, keratin, and elastin. The 'hard' phases are primarily strengthened by minerals, which nucleate and grow in a biomediated environment that determines the size, shape and distribution of individual crystals. The most important mineral phases are discussed: hydroxyapatite, silica, and aragonite.Using the classification of Wegst and Ashby, the principal mechanical characteristics and structures of biological ceramics, polymer composites, elastomers, and cellular materials are presented. Selected systems in each class are described with emphasis on the relationship between their structure and mechanical response. A fifth class is added to this: functional biological materials, which have a structure developed for a specific function: adhesion, optical properties, etc.An outgrowth of this effort is the search for bioinspired materials and structures. Traditional approaches focus on design methodologies of biological materials using conventional synthetic 0079-6425/$ -see front matter Ó

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Section: Mussel Byssusmentioning

confidence: 99%

Biological materials: Structure and mechanical properties

Meyers

Chen

Lin

et al. 2008

Progress in Materials Science

2,134

1,129

View full text Add to dashboard Cite

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“…Concentrated shear and radial stresses, called residual stresses, are generated where the interface between two mismatched materials intersects a free edge. These can lead to crack propagation parallel to the interface as well as other modes of failure (Rabin et al 1995). An interesting treatment of residual stresses in a model butt joint is illus- Table 2.…”

Section: Incremental Modulusmentioning

confidence: 99%

Elastomeric gradients: a hedge against stress concentration in marine holdfasts?

Waite

Vaccaro

Sun

et al. 2002

Phil. Trans. R. Soc. Lond. B

119

138

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The byssal threads of marine mussels are elastomeric fibres with a great capacity for absorbing and dissipating energy. Up to 70% of the total absorbed energy can be dissipated in the byssus. Because byssal threads attach the mussel to hard inert surfaces in its habitat, they must combine the need to be good shock absorbers with appropriate matching of Young's modulus between living tissue and a hard substratum such as stone-stiffnesses that can differ by five orders of magnitude. Recent data suggest that improved modulus matching and decreased stress concentration between different portions of the byssus is achieved by the use of protein gradients. Protein gradients in byssal threads are constructed using natural macromolecular chimeras having a central collagenous domain, variable flanking modules and histidine-rich amino and carboxy termini. Stiff silk-like flanking modules prevail distally, while at the animal end, rubbery modules resembling elastin predominate. In between the two thread ends there is a mix of both module types. The histidine-rich termini provide metal binding/cross-linking sites, while collagen domains may confer self-assembly on all parts of the structure. A graded axial distribution of flanking modules is expected to moderate stress concentration in joined materials having disparate moduli.

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“…This technology has somewhat mitigate performance issues arises from abrupt transitions between dissimilar materials viz. sharp interfaces due to joining via adhesion which induces substantial mechanical as well as thermal stresses [7]. Therefore, optimal fabrication process in which combination of several methods depending on the properties of the constituent materials must be implemented.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Calculation of Residual Thermal Stresses for Functionally Graded Hydroxyapatite-Titanium Plate Design

Jamaludin¹,

Mustapha²,

Nuruzzaman³

et al. 2013

A P J Eng Sci

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Abstract:Functionally graded materials (FGMs) have varying graded composition along their thickness as the result of a gradual transition of the properties belongs to the different composed materials. Whenever these two dissimilar materials are combined together, the residual stress caused certainly by the difference of coefficient of thermal expansion will leads to decohesion/delamination of the structures. This study aims to analyze the residual thermal stress for the design of functionally graded Hydroxyapatite-Titanium plate as a solution to the sharp interfaces. Finite element method (FEM) has been implemented for the parametric study to see the correlation between some parameters and the performance of the FGM structure. The results show that P = 1, t = ±0.8 mm and N ≥ 5 are the optimized and the best values for the compositional distribution exponent, thickness of the graded layers and the layer number, respectively. The calculated residual thermal stress values were verified through the comparison with the established results reported previously. In conclusion, the FEM is proved applicable for the design and evaluation of elastic residual thermal stress of an FGM structure.

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Fundamentals of Residual Stresses in Joints Between Dissimilar Materials

Cited by 31 publications

References 1 publication

Biological materials: Structure and mechanical properties

Biological materials: Structure and mechanical properties

Elastomeric gradients: a hedge against stress concentration in marine holdfasts?

Finite Element Calculation of Residual Thermal Stresses for Functionally Graded Hydroxyapatite-Titanium Plate Design

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