Manfred Staat

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Questions related from Manfred Staat

How do rubber-like materials fail in montone compression?

Rubber and rubber-like elastomers fail in a brittle manner. Therefore, I have some idea how the defect free bulk material fails. I have seen such failures in tension. But I have never seen any...

27 May 2022 2,018 2 View

Why is the strain intensity factor not used in the same way as the stress intensity factor in LEFM?

In linear elastic fracture mechanics (LEFM), only the stress intensity factor seems to be used. LEFM implies the same r−1/2 singularities of stress and strain at the crack tip. Very few articles...

04 September 2021 9,268 4 View

When is a beam a plate and when is a membrane/bar thick?

Wide beam, or when is the beam a plate? The bending stiffness of a beam with rectangular cross-section (h x b) is D=Eh3b/12 with E=Young's modulus. If the width b is large, the beam deflects like...

02 July 2021 9,417 0 View

Can strain based failure theories for brittle materials replace stress based theories?

Engineers are trained to think of stress limits and effective stress in strength of materials. Do you know strain limits and theories for effective strain? The idea to ask for strain limits came...

14 January 2020 402 1 View

Generalization of Kirsch's problem to finite plate?

Kirsch's celebrated 1898 problem gives the stress in points A and B at a circular hole in the infinite plate. For the finite plate a formula for the stress in point A is given in books. I am...

04 January 2020 9,125 0 View

What do the principal tensor invariants measure?

The trace of the linearized strain tensor measures the relative change of volume, the determinant of the (left or right) Cauchy-Green tensor is the square of the ratio deformed volume to...

01 January 1970 5,911 1 View