Temperature dependent fracture properties of NiTi-based Shape Memory Alloys (SMAs), within the pseudoelastic regime, were analyzed. In particular, the effective Stress Intensity Factor (SIF) was estimated, at different values of the testing temperature, by a fitting of the William's expansion series, based on Digital Image Correlation (DIC) measurements. It was found that temperature plays an i...

Abstract Fatigue crack growth of austenitic and martensitic NiTi shape memory alloys was analyzed, with the purpose capturing effects distinct stress-induced transformation mechanics in two crystal structures. Mode I experiments were carried out, near-crack-tip displacements captured by in-situ digital image correlation (DIC). A special fitting procedure, based on William’s solution, used to es...

At crack tip the stress distribution has singularities (i.e intensity is infinite) which physically impossible. Irwin realised that stresses at are finite and subsequently introduced Stress Intensify Factor(SIF). This factor used to determine this plastic zone size. The a special case of notch. Around notch, fracture needs volume develop according volumetric approach. characterised by distance ...

One of the most common forms of failures observed in flipchips brittle thin films subjected to stress is cracking. The crack growth rate depends on intrinsic film properties, stress and some environmental factors. In part 1 of this paper, we investigate central crack on different material planes. The planes are made from silicon, copper, aluminum, polyamide and silicon nitride. Each plane is 1....

This paper conducts a numerical analysis on the external surface cracked steel pipes reinforced with Composite Repair System. A three-dimensional finite element (FE) model is developed to calculate Stress Intensity Factor (SIF) of crack, and crack growth process evaluated by Paris’ law. The effect FRP-to-steel interfacial bond condition SIF evaluation has been considered incorporating cohesive ...

The scaled boundary finite element method (SBFEM) is extended for shape sensitivity analysis of stress intensity factors (SIFs) with respect to the crack geometry. The procedure combines the finite element formulations with the boundary discretization. The original equations of the SBFEM are reformulated as functions of the so-called scaling centre, synonymous to the crack tip. The variation in...

To tackle the difficulty in obtaining response data of chain and bulk coal under faults, this paper uses a new method for fault simulation scraper chains based on coupling multi-body dynamics (MBD), discrete element (DEM), finite (FEM). With force stacking angle as values, contact parameters were revised using rotary transport test. The simplified DEM-MBD model was verified from resistance poin...

The evaluation of stress intensity factors (SIFs) for cracks in mechanically fastened joints is one of the central issues in a damage tolerance analysis. Accurate stress intensity solutions may be difficult to determine due to geometric complexity along with variations in fastener load transfer and fastener interference and material thickness because of corrosion. Detailed finite element models...

An extensive literature review was conducted primarily to develop a comprehensive understanding of the quantitative behavior residual stress (RS) distribution in weld joints. Based on prior data, various levels peak RS and profiles were applied finite element analyses (FEA) model as an initial loading evaluate effect Mode-I intensity factor (SIF), KI. The not found have significant SIF values w...

In this paper, stress-intensity factor solutions are presented for an embedded elliptical crack in a round bar subjected to tensile load. The factors (SIF) tabulated form and were obtained from three-dimensional finite-element analyses of configuration. provide the as function three dimensionless parameters representative size, aspect ratio flaw its relative position cross section. cover ranges...