This paper presents the two uncoupled elastoplastic-damage models; Lemaitre’s and Vaz’s damage models. The models are implemented into finite element ABAQUS software using user routine UMAT to analyze predict evolution. In context of von-Mises yield criteria, variable fracture indicator predicted, in addition stress effective plastic strain. Both elastoplastic tangent operator return mapping pr...

since vehicle collision coverage, unlike what it seems, is not very profitable for insurance companies and is moving towards making losses, this paper considered the adequacy of measures and rates used by insurance companies, and intended to optimize the methods by employing more scientific approaches. in order to do so, first, the factors affecting the risk of policy holders were identified an...

OBJECTIVE To compare the performance of an extended model and a simplified prognostic model for joint damage in rheumatoid arthritis (RA) based on 3 baseline risk factors: anticyclic citrullinated peptide antibodies (anti-CCP), erosions, and acute-phase reaction. METHODS Data were used from the Nijmegen early RA cohort. An extended model and a simplified baseline prediction model were develop...

Fourteen disinfectants were tested in vitro for activity against soil bacteria and fungi attached to a boot worn in New Zealand, and then eight were further evaluated on three types of field-worn footwear. From in vitro tests sodium hypochlorite (JanolaTM), calcium hypochlorite (Haz-TabTM) and a quaternary ammonium product (Trimove) gave almost complete kill of bacteria. Four disinfectants (sod...

A novel two stage Improved Radial Basis Function (IRBF) neural network for the damage identification of a multimember structure in the frequency domain is presented. The improvement of the proposed IRBF network is carried out in two stages. Conventional RBF network is used in the first stage for preliminary damage prediction and in the second stage reduced search space moving technique is used ...

Rock burst is the most attractive and hot research area in geomechanics, mining, and civil engineering due to the increasing depth of mines and construction of deep underground structures. It has also been a severe problem in ground control measures in the last few decades. Many studies have been done by different researchers in order to minimize the hazards of rock burst and to provide a safe ...

In this paper, low cycle fatigue life of CK45 steel and SS316 stainless steel under strain-controlled loading are experimentally investigated. In addition, the impact of mean strain and strain amplitude on the fatigue life and cyclic behavior of the materials are studied. Furthermore, it is attempted to predict fatigue life using energy and SWT damage parameters. The experimental results demons...

In sheet metal forming processes with complex strain paths, a part is subjected to large plastic deformation. This severe plastic deformation leads to high plastic strain localization zones and subsequent accumulation of those strains. Then internal and superficial micro-defects and in other words ductile damage is created. This damage causes quality problems such as fracture. Therefore, design...

In this paper the capability of Gurson-Tvergaard-Needleman (GTN) model in the prediction of ductile damage in 7075-T651 aluminum alloy is investigated. For this purpose, three types of specimens were tested: Standard tensile bars, Round notched bar (RNB) specimens and compact tension (C(T)) specimens. Standard tensile bar tests were used to obtain the mechanical properties of the material and t...