One of the most intricate problems in terminal ballistics is the physics underlying penetration and perforation. Several penetration modes are well identified, such as petalling, plugging, spall failure and fragmentation (Sedgwick, 1968). In most cases, the final target failure will combine those modes. Some of the failure modes can be due to brittle material behavior, but penetration of ductil...

This paper describes a web-based finite element program called portal of damage. The purpose of the program is the numerical simulation of reinforced concrete framed structures, typically buildings, under earthquakes or others exceptional overloads. The program has so far only one finite element based on lumped damage mechanics. This is a theory that combines fracture mechanics, damage mechanic...

This thesis deals with the reliability and maintenance of structures that are damaged by shocks arriving randomly in time. The degradation is modeled as a cumulative stochastic point process. Previous studies mostly adopted expected cost rate criterion for optimizing the maintenance policies, which ignores practical implications of discounting of maintenance cost over the life cycle of the syst...

Differential diagnosis of acute viral hepatitis, persistent chronic hepatitis, aggressive chronic hepatitis, and post-necrotic cirrhosis can reasonably be achieved on the basis of three well-known liver-function tests: aspartate aminotransferase, alanine aminotransferase, and glutamate dehydrogenase. With use of principal-component analysis, these four liver diseases can be characterized by two...

This work is devoted to anisotropic continuum-damage mechanics in the quasi-static, isothermal, small-strain setting. We propose a framework for damage evolution based on compliance tensor as primary variable, context of generalized standard models dissipative solids. Based observation that Hookean strain energy density linear elasticity jointly convex and tensor, we design thermodynamically co...

Abstract Due to coupling of oxidation damage and mechanical damage,failure mechanism C/C composites is complex under high-temperature environment.In this paper,establishment cumulative analysis method based on damage.Based method,high-temperature model established: Initial criterion degradation mode stiffness in are modified by state parameter;Diffusion coefficient oxygen parameter.Through join...

Abstract Vehicular traffic represents the most influential loads on structural integrity of railway bridges, therefore design dynamic criteria. This work explores use strain measurements to characterize health condition bridges under moving train loads. Specifically, approach proposed in this exploits implementation auto‐regressive (AR) time series analysis for continuous damage detection. In l...