Mechanical APDL Structural Analysis Guide

11.3.2.1. Using VCCT for Energy-Release Rat e Calculation VCCT is based on the assumption that the energy needed to separat e a ...

II= − ∆ X∆ = − ∆ z∆ where: GI, GII, and GIII = mode I, II, and III energy-release rate, respectively ∆u, ∆v, and ∆w= relative di ...

The VCCT method for energy-release rat e calculation supports the following material behaviors: Linear isotropic elasticity Ort ...

program uses this group of nodes to form the necessary information for the VCCT calculation auto- matically. 3-D Flat Crack Geom ...

Example 2: ! Select nodes located along the crack front and ! define it as crack front/tip node component LSEL,,,, NSLL CM,CRACK ...

NSEL,S,LOC,X,Xctipn NSEL,R,LOC,Y,Yctipn NSEL,R,LOC,Z,Zctipn CM,CRACK_FRONT_NODE_CMn CINT,NEW,1 CINT,TYPE,VCCT CINT,CENC,CRACK_FR ...

CINT,SYMM,ON Example: CINT,NEW,1 CINT,TYPE,VCCT CINT,SYMM,ON! crack 1 is a symmetrical crack 11.3.2.2.4. Step 4: Specify Output ...

σaijuxεijaux iaux are the stress, strain and displacement of the auxiliary field, and qi is the crack-extension vector. The inte ...

Define the crack-tip node component and the crack-plane normal. This approach applies for both 2-D crack geometry and 3-D flat ...

where Par1 is the coordinate system number and Par2 is the axis of coordinate system Par1. Example 1 ! local coordinate system L ...

Repeat this method for all node locations along the crack front. Although the program automatically calculates the local coordin ...

irregular behavior of the stress-intensity factor distribution along crack front. The program automatically calculate the local ...

11.3.3.2. Calculating Stress-Intensity Factors via Displacement Extrapolation The POST1 ppostprocessing KCALC command (Main Menu ...

with symmetry boundary conditions, a half-crack model with antisymmetry boundary conditions, or a full-crack model. Command(s): ...

SOLID187 T-stress evaluation supports the following material behavior: Linear isotropic elasticity Isotropic plasticity Even ...

mat ie ne = ∏∫² ( ⋅ ∇ ) iw ie = 1 iw ie Σ = ∇ The Eshelby stress (Σ) is introduced in small-strain elasticity as: j j j j j j = ...

Here, e 1 is the tangential component of the local coordinate system with respect to the crack surface, while e 2 represents the ...

adjacent to the first contour of elements. The procedure is repeated for all contours. To ensure correct results, the elements f ...

Example 11.1: Initiating a New Material Force Calculation CINT,NEW,1! initiate a new material force calculation as #1 CINT,TYPE, ...

direction to the plane formed by the crack-plane normal and the tangent direction of the crack-tip node, and is normalized to a ...