Results 211 to 220 of about 79,182 (234)

Fatigue crack propagation under non-proportional mixed mode loading

Engineering Fracture Mechanics, 1999
Abstract Under non-proportional mixed I+II loading, two kinds of stable crack propagation may be distinguished. An existing precrack will either kink, mode I controlled (tensile mode), or will propagate, coplanarly mode II controlled (shear mode). Shear mode growth will occur if the effective mode II range exceeds the material-specific threshold Δ K
R Plank, G Kuhn
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Non-proportional loading of Nylon 66 at room temperature

International Journal of Plasticity, 1998
Abstract Tubular specimens of commercial Nylon 66 were subjected to non-proportional loading in strain control at room temperature. All tests were performed in a servohydraulic, computer-controlled, MTS axial-torsion mechanical testing machine using a biaxial clip-on extensometer.
E. Krempl, C.M. Bordonaro
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Sequentially linear analysis of fracture under non-proportional loading

Engineering Fracture Mechanics, 2008
Sequentially linear analysis avoids convergence problems typical of non-linear finite element analysis by directly specifying a damage increment instead of a load or displacement increment. A series of linear analyses is used to model highly non-linear behavior without an iterative solution algorithm. The primary contribution herein is the extension of
Matthew J. DeJong, Max A.N. Hendriks, Jan G. Rots   +2 more
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Biaxial fatigue for proportional and non‐proportional loading paths

Fatigue & Fracture of Engineering Materials & Structures, 2004
ABSTRACTIn order to study the use of a local approach to predict crack‐initiation life on notches in mechanical components under multiaxial fatigue conditions, the study of the local cyclic elasto‐plastic behaviour and the selection of an appropriate multiaxial fatigue model are essential steps in fatigue‐life prediction. The evolution of stress–strain
L. REIS, B. LI, M. De FREITAS
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Multiaxial Fatigue in Drill Pipes Under Non-Proportional Loading

Volume 5: High-Pressure Technology; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); SPC Track for Senate, 2017
The scope of this research is to estimate the fatigue life and crack initiation direction in components subjected to multiaxial, nonproportional loading. Two critical plane approaches — Fatemi-Socie and McDiarmid — were used to estimate low cycle and high cycle fatigue lives, respectively.
Nahla A. Helmy, Maher Y. A. Younan
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Multiaxial low cycle fatigue life under non-proportional loading

International Journal of Pressure Vessels and Piping, 2013
Abstract A simple and clear method of evaluating stress and strain ranges under non-proportional multiaxial loading where principal directions of stress and strain are changed during a cycle is needed for assessing multiaxial fatigue. This paper proposes a simple method of determining the principal stress and strain ranges and the severity of non ...
Takamoto Itoh, Masao Sakane, Kazuki Ohsuga   +2 more
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A spectral fatigue method incorporating non-proportional multiaxial loading

International Journal of Fatigue, 2020
Abstract A frequency domain method incorporating multiaxial non-proportional loading conditions is presented in this paper. The non-proportionality is modelled by implementing a multiaxial cycle counting procedure of path dependent maximum range\moment of load path proposed recently by Mei and Dong (2016) in frequency domain through a formulation of ...
Sandipp Krishnan Ravi, Pingsha Dong
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Creep Deformation and Rupture Under Non-Proportional Loading

1981
The behaviour of copper, an aluminium alloy and Nimonic 80A has been investigated for non-proportional loading conditions. The results of simple creep experiments conducted on thin tubes are reported and are interpreted in the light of a single state variable theory for proportional loading. It is shown that the behaviour of the chosen materials may be
W. A. Trampczynski, D. R. Hayhurst
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EVALUATION OF LOW CYCLE FATIGUE UNDER NON‐PROPORTIONAL LOADING

Fatigue & Fracture of Engineering Materials & Structures, 1996
Abstract— A series of low cycle fatigue experiments have been conducted on a 42CrMo steel under tension‐torsion loading. Thin‐walled tube specimens were used. Low cycle fatigue under various loading paths, including circular and square paths, have been investigated.The plastic work criterion for low cycle fatigue failure has previously been generally ...
X. Chen, Q. Gao, A. Abel, S. Wu
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The buckling loads of unbraced PR frames under non-proportional loading

Journal of Constructional Steel Research, 2002
Abstract This paper discusses the elastic stability of unbraced frames with partially restrained (PR) connections under non-proportional loading drawing upon the concept of storey-based buckling. The problem of determining critical elastic buckling loads of the frames under non-proportional loading is expressed as a pair of minimization and ...
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