The failure response of aluminum alloys (Al-6061 and Al-7075) under the condition of simultaneously pre-stressing and laser heating was investigated. Specimens were subjected to predetermined preloading states and then irradiated by continuous wave fiber (Yb) laser. For all specimens, it was found that the yield stress decreased with increasing laser power density. This implies that the load-be...

Widespread processes in nature and technology are governed by the dynamical transition whereby a material an initially solid-like state, whether soft or hard, then yields. Major unresolved questions concern any will yield smoothly gradually (``ductile'' behavior) fail abruptly catastrophically (``brittle'' behavior); roles of sample annealing, disorder, shear band formation onset yielding failu...

AIMS To determine the long-term (20 years from presentation) outcome of brittle type 1 diabetes characterized by recurrent episodes of ketoacidosis (DKA). METHODS The cohort studied was a group of brittle diabetic patients from various parts of UK originally identified between 1979 and 1985. Patients were traced, where possible, via their diabetic clinics and/or general practitioners. Data on...

We propose a numerical model based on static fatigue laws in order to model the time-dependent damage and deformation of rocks under creep. An empirical relation between time-to-failure and applied stress is used to simulate the behavior of each element of our finite element model. We first review available data on creep experiments, in order to study how the material properties and the loading...

2014 The form of the failure probability distribution for discrete and continuum percolation in the critical region is obtained. The existence of bond-strength fluctuations in continuum percolation changes the distribution from a very steep form (at least an exponential of an exponential) to a Weibull-like form (exponential of a powerlaw). Futhermore, a size effect of the typical failure streng...

Rock failure during tunnel excavation is still a matter of concern. The influence groundwater generally taken into account along discontinuities or in “soil-like” formations. However, brittle saturated porous rocks can be subject to undrained conditions excavation. Negative effective stresses develop close the boundary. This study aims at identifying limit pore pressure rock around tunnel, whic...

Paclitaxel is a current standard chemotherapeutic drug for ovarian cancer with several side effects. Recurrences of drug resistant clones have been considered the serious problem in the failure of chemotherapy. Medicinal marine natural products have been intensively proposed as diverse chemotherapeutic agents. Therefore there is an affinity to find efficient modality to overwhelm ovarian cancer...