Crack propagation in fracture mechanical graded structures
Journal Title: Frattura ed Integrità Strutturale - Year 2015, Vol 9, Issue 34
Abstract
The focus of manufacturing is more and more on innovative and application-oriented products considering lightweight construction. Hence, especially functional graded materials come to the fore. Due to the application-matched functional material gradation different local demands such as absorbability, abrasion and fatigue of structures are met. However, the material gradation can also have a remarkable influence on the crack propagation behavior. Therefore, this paper examines how the crack propagation behavior changes when a crack grows through regions which are characterized by different fracture mechanical material properties (e.g. different threshold values KI,th, different fracture toughness KIC). In particular, the emphasis of this paper is on the beginning of stable crack propagation, the crack velocity, the crack propagation direction as well as on the occurrence of unstable crack growth under static as well as cyclic loading. In this context, the developed TSSR-concept is presented which allows the prediction of crack propagation in fracture mechanical graded structures considering the loading situation (Mode I, Mode II and plane Mixed Mode) and the material gradation. In addition, results of experimental investigations for a mode I loading situation and numerical simulations of crack growth in such graded structures confirm the theoretical findings and clarify the influence of the material gradation on the crack propagation behavior.
Authors and Affiliations
B. Schramm, H. Richard
Keywords
Related Articles
- EP ID EP143571
- DOI 10.3221/IGF-ESIS.34.30
- Views 65
- Downloads 0
A new micromechanical model of CNT-metal nanocomposites with random clustered distribution of CNTs
Uniform dispersion of carbon nanotubes (CNTs) is a key issue for utilization of their reinforcement potential in CNT-reinforced metal matrix nanocomposites (MMNCs). It was reported that CNT clusters often exist i...
Natural minerals mixture for enhancing concrete compressive strength
The construction material quality is required to be improved in order to enhancing structure stability, optimizing construction cost and quality. The kaolin and bentonite have been mixed in equal quantity and treat...
An ideal model for stress-induced martensitic transformations inshape-memory alloys
In this paper, a novel model for stress-induced martensitic transformations in shape-memory alloysis proposed. Accordingly, the constitutive pseudo-elastic behavior of these materials is described. The modelaccount...
Considerations on the choice of experimental parameters in residual stress measurements by hole-drilling and ESPI
Residual stresses occur in many manufactured structures and components. Great number of investigations have been carried out to study this phenomenon. Over the years, different techniques have been developed to m...
Weight Function Method for computations of crack face displacements and stress intensity factors of center cracks
The weight function method provides a powerful and reliable tool for the determination of the stress intensity factor around the crack tip in a linearly elastic cracked solid subjected to arbitrary loading condit...