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Category: Theory

Blatz-Ko Model

2022-01-03

The Blatz-Ko model can be used for both foams and rubber-like materials. This article explains the theory.

Anisotropic Hill Strain

2021-12-22

Anisotropic materials often need an effective strain measure. The Hill strain is useful in those cases.

Hill Stress

2021-12-20

Definition of the Hill Stress and how to use it in material models.

Is Pure Shear the Same as Planar Tension?

2021-12-03

This article examines the difference between simple shear, pure shear, and planar tension.

Is Uniaxial Compression the Same as Biaxial Tension?

2021-11-28

It would be very handy if uniaxial compression was the same as biaxial tension. But is it? This article has the answer.

How Important is the Bulk Modulus in FEA?

2021-11-22

Investigation of how important the bulk modulus is in a FE simulation. Using MCalibration and Abaqus, I show that most of the time the bulk modulus has virtually no influence on the FE results.

Theory of the Yield Stress Dependence on Strain-Rate

2021-10-11

Theory of how the constitutive elements influence the predicted yield stress dependence on strain rate

Best Material Model for Polycarbonate at High and Low Strain Rates

2021-10-11

Review of how different material models can be used to predict the non-linear response of PC. Also covers how the yield stress depends on the strain rate.