Refine
Year of publication
Document Type
- Conference Proceeding (19)
- Article (9)
- Lecture (3)
Has Fulltext
- yes (31) (remove)
Keywords
- Finite-Elemente-Methode (7)
- Einspielen <Werkstoff> (4)
- Limit analysis (4)
- Shakedown analysis (3)
- Technische Mechanik (3)
- Analytischer Zulaessigkeitsnachweis (2)
- Bruchmechanik (2)
- Einspiel-Analyse (2)
- FEM (2)
- Shakedown (2)
- ratchetting (2)
- shakedown (2)
- shakedown analysis (2)
- Alternating plasticity (1)
- Anastomose (1)
- Anastomosis (1)
- Arthosetherapie (1)
- Aufschlagversuch (1)
- Axialbelastung (1)
- Axially cracked pipe (1)
- Biomechanics (1)
- Biomechanik (1)
- Biomedizinische Technik (1)
- Deformation (1)
- Design-by-analysis (1)
- Druckbeanspruchung (1)
- Druckbehälter (1)
- Druckbelastung (1)
- Einspiel-Kriterium (1)
- Einspielen (1)
- Elastostatics (1)
- Exact Ilyushin yield surface (1)
- Fehlerstellen (1)
- Finite element method (1)
- First Order Reliabiblity Method (1)
- First-order reliability method (1)
- Fließgrenze (1)
- Fußball (1)
- Global and local collapse (1)
- Gonarthrose (1)
- Grenzwertberechnung (1)
- Kinematics (1)
- Kinetics (1)
- Kniegelenkarthrose (1)
- Knochen (1)
- Knochenbildung (1)
- Knochenchirugie (1)
- Knochendichte (1)
- MBST (1)
- Mechanics (1)
- PFM (1)
- Plastizität (1)
- Pressure loaded crack-face (1)
- Progressive plastic deformation (1)
- Random variable (1)
- Ratcheting (1)
- Ratchetting (1)
- Rohr (1)
- Rohrbruch (1)
- Schienbeinschoner (1)
- Schwammknochen (1)
- Sensitivity (1)
- Shakedown criterion (1)
- Stahl (1)
- Statics (1)
- Strukturanalyse (1)
- Temperaturabhängigkeit (1)
- Traglastanalyse (1)
- Wolff's Law (1)
- Wolffsches Gesetz (1)
- Zug-Druck Belastung (1)
- alternierend Verformbarkeit (1)
- arthrosis therapy (1)
- bone density (1)
- bone structure (1)
- burst pressure (1)
- burst tests (1)
- cancellous bone (1)
- design-by-analysis (1)
- finite element analysis (1)
- flaw (1)
- fortschreitende plastische Deformation (1)
- gonarthrosis (1)
- limit and shakedown analysis (1)
- linear kinematic hardening (1)
- load limit (1)
- material shakedown (1)
- nonlinear kinematic hardening (1)
- pipes (1)
- probabilistic fracture mechanics (1)
- second-order reliability method (1)
- tension–torsion loading (1)
- vessels (1)
- yield stress (1)
Institute
- IfB - Institut für Bioengineering (31) (remove)
Extension fractures are typical for the deformation under low or no confining pressure. They can be explained by a phenomenological extension strain failure criterion. In the past, a simple empirical criterion for fracture initiation in brittle rock has been developed. In this article, it is shown that the simple extension strain criterion makes unrealistic strength predictions in biaxial compression and tension. To overcome this major limitation, a new extension strain criterion is proposed by adding a weighted principal shear component to the simple criterion. The shear weight is chosen, such that the enriched extension strain criterion represents the same failure surface as the Mohr–Coulomb (MC) criterion. Thus, the MC criterion has been derived as an extension strain criterion predicting extension failure modes, which are unexpected in the classical understanding of the failure of cohesive-frictional materials. In progressive damage of rock, the most likely fracture direction is orthogonal to the maximum extension strain leading to dilatancy. The enriched extension strain criterion is proposed as a threshold surface for crack initiation CI and crack damage CD and as a failure surface at peak stress CP. Different from compressive loading, tensile loading requires only a limited number of critical cracks to cause failure. Therefore, for tensile stresses, the failure criteria must be modified somehow, possibly by a cut-off corresponding to the CI stress. Examples show that the enriched extension strain criterion predicts much lower volumes of damaged rock mass compared to the simple extension strain criterion.