Institute of Physics of Materials AS CR, v. v. i. > Projects > Linear Elastic Fracture Mechanics of Bi-material notches

Linear Elastic Fracture Mechanics of Bi-material notches

Investigatordoc. Ing. Jan Klusák, Ph.D.
Number of Project106/03/P054
AgencyGrantová agentura České republiky
Duration2002-12-31 - 2005-12-30

Existence of general singular stress concentrators (of non-crack type) in engineering constructions influence distinctly stress distribution and working potential in solids. Methods of classic fracture mechanics that are valid for behaviour description of crack type stress concentrators (i.e. with stress singularity exponent p = 1/2) cannot be used for these cases. Project is focused on fracture mechanics analysis of bi-material wedge, which is considered as synthesis of two general singular stress concentrators (V-notch and bi-material interface). For this case, the stress singularity exponent lies in interval 0 < p < 1 and depends on open angle characterizing V-notch and bi-material parameters characterizing both materials. The object of the project is to describe bi-material wedge behaviour from linear fracture mechanics point of view, notably to determine instability conditions (state when crack is initiated from a tip of bi-material wedge). Numerical model (based on finite element method) for fracture mechanics parameters evaluation will be realized. Results of these studies contribute to building of unified phenomenological fracture mechanics description of cracks and general singular defects. Results have substantial practical importance for construction design using composite materials.