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Hi,

I'm conducting hypoplastic VUMAT model in abaqus. It always has the following problem. 

***ERROR: Bad Material definition in element number 1: zero or negative
initial dilatational modulus caused by bad material data. Please
check your material input and any initial conditions if necessary.

For the single layer,it works well,but this problem will appear for two layers, even if I chose the same parameters.

Hoping anyone who has the same problem or has already settled successfully could give me some advice.

Hello,

It is some time that I am struggling for making a physical interperation of the MAXSCRT in ABAQUS  and crack initiation.

When the MAXSCRT in ABAQUS in cohesive element is equal to 1, does it mean that the crack has been formed or just it means that irreversible deformation in the element has been formed?

Thank you,

Dear All,

This post will be continued in Turkish Language because this is related to Moving (means Evden eve nakliyat) in Turkey.

I am
looking for postdoctoral position in the field of mechanical and material
engineering. I have my PhD from Louisiana State University, and currently
working with Dr. Khonsari at  Louisiana State University.

During
my Phd I was working on the material characterization and fatigue of metals and
composite materials using thermodynamic approach.

I have
the skills of modeling metals and composite materials failure using user
subroutines programing  in ABAQUS.

The sources of noise in a vehicle are many, including the engine, driveline, tire contact patch and road surface, brakes, and wind to name a few.  A Noise, Vibration, and Harshness (NVH) engineer is tasked with predicting these noises early in the design phase to make the necessary adjustments to ensure a harmonic ride, so to speak. The latest SIMULIA Tech Brief illustrates the effects that rolling tires have in contributing to NVH.