46 citations · 51 across the 7 of their papers we have counts for
7 papers
The Armstrong-Frederick cyclic hardening plasticity model with Cosserat effects
Krzysztof Chelminski, Patrizio Neff, Sebastian Owczarek
We propose an extension of the cyclic hardening plasticity model formulated by Armstrong and Frederick which includes micropolar effects. Our micropolar extension establishes coerc…
On the characterization of drilling rotation in the 6-parameter resultant shell theory
Mircea Birsan, Patrizio Neff
We analyze geometrically non-linear isotropic elastic shells and prove the existence of minimizers. In general, the model takes into account the effect of drilling rotations in she…
Sum of squared logarithms - An inequality relating positive definite matrices and their matrix logarithm
Mircea Birsan, Patrizio Neff, Johannes Lankeit
Let y1, y2, y3, a1, a2, a3 > 0 be such that y1 y2 y3 = a1 a2 a3 and y1 + y2 + y3 >= a1 + a2 + a3, y1 y2 + y2 y3 + y1 y3 >= a1 a2 + a2 a3 + a1 a3. Then the following inequality hold…
Existence of minimizers in the geometrically non-linear 6-parameter resultant shell theory with drilling rotations
Mircea Birsan, Patrizio Neff
The paper is concerned with the geometrically non-linear theory of 6-parametric elastic shells with drilling degrees of freedom. This theory establishes a general model for shells,…
On the convexity of the function C --> f(det C) on positive definite matrices
Stephan Lehmich, Patrizio Neff, Johannes Lankeit
We prove a condition on f \in C^2(\R+,\R) for the convexity of (f o det) on PSym(n), namely that f o det is convex on PSym(n) if and only if f"(s)+(n-1)/(ns) f'(s) >= 0 and f'(s)<=…
A Canonical Extension of Korn's First Inequality to H(Curl) motivated by Gradient Plasticity with Plastic Spin
Patrizio Neff, Dirk Pauly, Karl-Josef Witsch
We prove a Korn-type inequality in H(Curl) for tensor fields.