Sandwich structures are widely used for the design and fabrication of lightweight structural systems, due to their capability exhibit excellent thermal performances at low material usage. Understanding phenomena propagation macro-cracks in core delamination face-to-core interface aspects great computational interest. Linking sophisticated models with actual characterisation mechanical propertie...

This paper presents a new continuum shape sensitivity method for calculating the mixed-mode stress-intensity factors of a stationary crack in two-dimensional, linear-elastic, orthotropic functionally graded materials with arbitrary geometry. The method involves the material derivative concept taken from continuum mechanics, the mutual potential energy release rate, and direct differentiation. S...

Reviewing work done in collaboration with Jennifer Hodgdon, we derive the most general crack growth law allowed by symmetry for mixed-mode three-dimensional fracture. We do so using the system developed in condensed matter physics to derive new laws that emerge on long length and time scales. In our derivation, we provide a symmetry interpretation for the three modes of fracture, we rederive th...

Linearly Increasing Stress Tests conducted in 30 C aerated distilled water using as-quenched 4340 and 3.5NiCrMoV turbine rotor steels indicated that stress corrosion cracking occurred at all applied stress rates for 4340 steel, whilst only at applied stress rates less than or equal to 0.002 MPa s 1 for the turbine rotor steel. The crack velocity increased with increasing applied stress rate for...

This paper describes the testing of laser deep penetration processing on controlled fragmentation high carbon steel (50SiMnVB). The objective this research is to make use defects in zones and optimize quality prefabricated cracks. shows that a deeper central crack appear zone when heat input 60 J/mm, appeared affected by martensite microstructure, microhardness magnitude tensile stress. Further...

Measurement of fracture parameters for a rapidly growing crack in syntactic foam sheets using image correlation technique and high-speed photography is presented. The performance of a rotating mirror-type multi-channel high-speed digital camera to measure transient deformations is assessed by conducting benchmark tests on image intensity variability, rigid translation and rigid rotation. Edge-c...