nach oben

2018 | Buch

Kapitel lesen Erstes Kapitel lesen

Interface Fracture and Delaminations in Composite Materials

verfasst von: Leslie Banks-Sills

Verlag: Springer International Publishing

Buchreihe : SpringerBriefs in Applied Sciences and Technology

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik" , Springer Professional "Wirtschaft"

Einloggen, um Zugang zu erhalten

Über dieses Buch

Part I of this SpringerBrief presents the problem of a crack between two dissimilar isotropic materials and describes the mathematical background. A fracture criterion is discussed and Methods for calculating fracture parameters such as stress intensity factors using the finite element method and three post-processors are considered. Actual test data and both deterministic and statistical failure curves are presented.In Part II of the book, similar descriptions are given for delaminations in composite laminates. The mathematical treatment of this type of damage including the first term of the asymptotic expansion of the stress and displacement fields is considered. Numerical post-processors for determining stress intensity factors for these cases are reviewed. Two examples of specific laminates are presented: one with a failure curve and the other with a failure surface. Finally, beam specimens used for testing such failures are discussed.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract

In this chapter, the basic tenets of fracture mechanics are described. The first term of the asymptotic expression for the stress and displacement fields in the neighborhood of a crack tip is presented for a homogeneous, isotropic, linear elastic material. The concept of fracture modes and stress intensity factors are discussed. The energy approach through the Griffith energy is delineated. A presentation of the J-integral and its relationship to the Griffith energy and the stress intensity factors is given. A description of a fracture criterion through the fracture toughness is presented.

Leslie Banks-Sills

Interface Fracture

Frontmatter

Chapter 2. Fundamentals of Interface Fracture Mechanics

Abstract

In this chapter, the basic principles of interface fracture mechanics are presented. After a brief description of the development of interface fracture, the first term of the asymptotic expression for the stress and displacement fields in the neighborhood of an interface crack tip between two homogeneous, isotropic, linear elastic materials is presented. The energy release rate for this crack type, as well as the J-integral are described. Both deterministic and statistically obtained fracture criteria are discussed.

Leslie Banks-Sills

Chapter 3. Calculation of Stress Intensity Factors – An Interface Crack

Abstract

In this chapter, aspects of the finite element method for obtaining the displacement field of a body containing an interface crack are described. Square-root singular, quarter-point elements in two and three dimensions will be presented. Once the displacement field is found three methods are suggested for computing stress intensity factors; they include the displacement extrapolation (DE) method, the conservative interaction energy integral or M-integral, and the Virtual Crack Closure Technique (VCCT). The stress intensity factors are then employed to obtain the interface energy release rate and two phase angles.

Leslie Banks-Sills

Chapter 4. Testing–Interface Crack Between Two Isotropic Materials

Abstract

In this chapter, an interface crack between two dissimilar linear elastic, homogeneous and isotropic materials is considered. Methods of testing, as well as some test results are presented.

Leslie Banks-Sills

Delaminations in Composites

Frontmatter

Chapter 5. Mathematical Treatment of Delaminations

Abstract

In this chapter, a delamination in a multi-directional (MD) fiber reinforced laminate composite is considered. This problem is treated as an interface crack between two dissimilar anisotropic materials with both a square-root stress singularity and an oscillating, square-root singularity at the crack tip. The mechanical and thermal properties of the composite plies are obtained by means of homogenization. Several interfaces are considered including \(0^{\circ }//90^{\circ }\), \(+45^{\circ }//-45^{\circ }\), \(30^{\circ }//-60^{\circ }\) and \(-30^{\circ }//60^{\circ }\), as well as an interface between two woven plies of an MD laminate. The double slash represents the position of the delamination relative to the ply directions. The first term of the asymptotic expansion of the stress and displacement fields will be presented together with the interface energy release rate, phase angles and the J-integral.

Leslie Banks-Sills

Chapter 6. Methods of Calculating Stress Intensity Factors–Delaminations

Abstract

In this chapter, methods for obtaining the stress intensity factors, interface energy release rate and phase angles are presented for interface cracks between two anisotropic materials. These methods include displacement extrapolation, the conservative interaction energy or M-integral and the Virtual Crack Closure Technique. Although these methods have been formulated with the finite element method in mind, they may be adapted to all numerical techniques which provide field quantities.

Leslie Banks-Sills

Chapter 7. Testing–Delamination Between Two Dissimilar Plies

Abstract

In this chapter, results are presented for the fracture toughness or critical interface energy release rate under mixed mode conditions. Deterministic and probabilistic criteria are considered. In addition, beam type specimens which are recommended in international standards are presented.

Leslie Banks-Sills

Backmatter

Titel: Interface Fracture and Delaminations in Composite Materials
verfasst von: Leslie Banks-Sills
Verlag: Springer International Publishing
Electronic ISBN: 978-3-319-60327-8
Print ISBN: 978-3-319-60326-1
DOI: https://doi.org/10.1007/978-3-319-60327-8

Premium Partner

Marktübersichten

Die im Laufe eines Jahres in der „adhäsion“ veröffentlichten Marktübersichten helfen Anwendern verschiedenster Branchen, sich einen gezielten Überblick über Lieferantenangebote zu verschaffen.

Zur Marktübersicht