a8-quasi-static-kwa8-quasi-static-kw.docVIP

Question W8–1: What analysis procedure is used in this input file? The analysis procedure is a natural frequency extraction (?FREQUENCY). The procedure option must immediately follow the ?STEP option. Question W8–2: In Abaqus a distinction is made between linear perturbation analysis steps and general analysis steps. What type of procedure is the analysis procedure in this input file? The ?FREQUENCY option is a linear perturbation procedure. Question W8–3: In an analysis with more than one step in the same input file, what influence does the result of a linear perturbation step have on the base state of the model for the following analysis step? None. Only general analysis steps change the base state of the model. Question W8–4: How does the order of the line segments affect the ability of Abaqus to resolve the contact condition? The order of the line segments determines the direction of the outward normal vector of the rigid surface. If the outward normal points in the wrong direction, Abaqus cannot establish the contact between the surfaces and, therefore, cannot find a solution. Question W8–5: What effect will an increase in friction have on the solution? An increased friction coefficient will increase the critical shear stress ?crit at which sliding of the blank begins. Thus, the material will be stretched more, causing further thinning of the material and increasing the stresses. Question W8–6: In Abaqus the input data are classified as either model or history data. What type of data is the contact pair definition in Abaqus/Explicit? What type of data is the contact pair definition in Abaqus/Standard? The contact pair definition is history data in Abaqus/Explicit and model data in Abaqus/Standard. Question W8–7: When entering plasticity data with the ?PLASTIC option, what are the stress and strain measures that Abaqus uses? Abaqus uses true (Cauchy) stress and log strain. Question W8–8: What effects would a higher damping coefficient ha