The toughness of epoxy polymers containing microvoids

Huang, Yating; Kinloch, A. J.

doi:10.1016/0032-3861(92)90785-u

Cited by 89 publications

(45 citation statements)

References 4 publications

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“…16) Reduction of such crack tip stress, by minimizing size of flaws 17) or by exploiting a laminar structure, 18) could be a way to reinforce materials. We could reinforce materials also by embedding spherical voids (or particles) in materials, 19) because a sharp crack is stopped when it meets such a cavity: it is well-known that the crack tip is blunted by the void. 15) However, in materials with many voids or in structured materials, including cellular solids, porous materials, foams and gels, the continuum view breaks down on the scale of cell size.…”

Section: Introductionmentioning

confidence: 99%

Crack-Tip Stress Concentration and Structure Size in Nonlinear Structured Materials

Aoyanagi

Okumura

2009

J. Phys. Soc. Jpn.

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We revisit the standard elastic-plastic fracture theory developed by Hutchinson, Rice, and Rosengren (HRR) and reproduce, by a simple scaling argument, the stress singularity around the crack tip derived by HRR. From the singular behavior thus reconfirmed, we propose a general scaling relation which guarantees an effect similar to the tip-blunting effect: the maximum stress at the crack tip in a structured material can be reduced by increasing the structure size. This proposed relation is explicitly confirmed by numerical calculations performed for a coarse-grained lattice model, and leads to general scaling relations for fracture surface energy and to a possible reinforcement of cellular solids due to the pores.

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Section: Introductionmentioning

confidence: 99%

Crack-Tip Stress Concentration and Structure Size in Nonlinear Structured Materials

Aoyanagi

Okumura

2009

J. Phys. Soc. Jpn.

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“…For example, several researchers [55][56][57] have applied the FEM appraoch to examine the role of rubber particle cavitation in shear band formation at crack tips. Sue et al [58] have used FE to show that rigid organic particles could also innate shear banding when under an uniaxial tension stress field.…”

Section: Key Issues and Questionsmentioning

confidence: 99%

Introduction to the Toughening of Polymers

Pearson

2000

Toughening of Plastics

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The purpose of this chapter is to provide the background needed for subsequent chapters on toughened plastics. This chapter introduces the topic of fracture mechanics, describes the methods used to quantify toughness, discusses the origin of toughness in terms of toughening mechanisms, briefly reviews the factors influencing toughness, and comments on the latest advances in the science of the toughening of polymers. The main focus is on polymers blends toughened by a soft rubber phase although several alternative approaches are briefly mentioned. The purpose of this book is to present the latest advances in the field of toughened polymers so that the materials specialist can use these latest concepts to create new materials with improved toughness.

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“…Significant toughening of structural adhesives is attainable with addition of nano and/or micro particles [1,2,3]. Tapered Double Cantilever Beam (TDCB) experiments, conducted at University College Dublin (UCD), have observed a significant dependence of the fracture toughness of these adhesives on bond gap thickness [5].…”

Section: Introductionmentioning

confidence: 99%

A numerical investigation of spherical void growth in an elastic–plastic continuum

Leonard

Murphy

Karač

2012

Computational Materials Science

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Significant toughening of structural epoxy adhesives has been achieved with the addition of nano and micro-scale particles. However, the toughening mechanisms introduced by the addition of these particles is not very well understood. The ultimate aim of this research is to develop an understanding of the toughening mechanisms present and investigate the parameters which affect the degree of toughening, i.e. particle size, particle volume fraction and particle distribution to guide future adhesives development. The current work examines the growth of a single void in an elastic-plastic material as a function of constraint and compares the results with the predictions of the classic Rice & Tracey model.

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The toughness of epoxy polymers containing microvoids

Cited by 89 publications

References 4 publications

Crack-Tip Stress Concentration and Structure Size in Nonlinear Structured Materials

Crack-Tip Stress Concentration and Structure Size in Nonlinear Structured Materials

Introduction to the Toughening of Polymers

A numerical investigation of spherical void growth in an elastic–plastic continuum

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