2 edition of Multiaxial strength and fatigue of rubber compounds found in the catalog.
Multiaxial strength and fatigue of rubber compounds
Joseph F. Hallett
Written in English
Thesis (Ph.D.) - Loughborough University, 1997.
|Statement||by Joseph F. Hallett.|
Science and Technology of Rubber, Second Edition, provides a general survey of elastomers and an examination of rubberlike elasticity, with an emphasis on a unified treatment ranging from physical theory to final applications. Researchers in polymer science and engineering fields will find coverage of recent advances, unsolved problems and projections, and processing. Multiaxial fatigue loadings can change the fatigue properties. Especially fatigue ductility decreases in high temperatures. Zamrik et al 2° thought that the transition region in strain-fatigue life curve represented the fatigue strength coefficient and fatigue ductility coef-.
Undispersed filler agglomerates or other substantial inclusions/contaminants in rubber can act as large crack precursors that reduce the strength and fatigue lifetime of the material. To demonstrate this, we use tensile strength (stress at break, σb) data from 50 specimens to characterize the failure distribution behavior of carbon black (CB) reinforced styrene-butadiene rubber (SBR) compounds. to propose a multiaxial fatigue life criterion for rubber. 2. Material and mechanical testing The elastomer used in the present study was a vulcanized natural rubber material (NR) ﬁlled with 23 parts of reinforcing carbon black (N, N) per hundred part of rubber. The molecular structure consist of cisK1,4-polyisoprene chains.
This is mainly due to the fact that multiaxial loading effects in rubber, which often undergoes large strain loading conditions, are not yet well understood (Mars & Fatemi ). Two works can be found in the lit-erature which deal with the application of the criti-cal plane approach to rubber fatigue: Saintier et al. Fatigue crack growth often results in rough fatigue crack surfaces. The rough fatigue crack surface is, in part, thought to result from anisotropy being developed at the front of a crack tip. This anisotropy in strength whereby the material is less strong in the direction that the material is stretched might allow the fatigue crack to grow in an.
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The multiaxial fatigue experiments described provide empirical evidence from which an understanding of the mechanics of the fatigue process in rubber can be developed. Each of the four equivalence parameters described in Part I has been applied to the axial‐torsion fatigue experiments described in Cited by: Multiaxial strength and fatigue of rubber compounds.
By Joseph F. Hallett. Get PDF (34 MB) Abstract. Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough e real applications having complex triaxial loading, current physical test methods to predict component Author: Joseph F.
Hallett. This book provides practicing engineers, researchers, and students with a working knowledge of the fatigue design process and models under multiaxial states of stress and strain.
Readers are introduced to the important considerations of multiaxial fatigue that differentiate it from uniaxial fatigue. The article discusses the differences between low-cycle fatigue and high-cycle fatigue (HCF) behaviors. Several other features of multiaxial fatigue are also explained, including mean stress effects, sequences of stress/strain amplitude or stress state, nonproportional loading and cycle counting, and HCF fatigue.
The purpose of this study is to give an insight on the existing fatigue criteria for rubbers and their capability to predict the fatigue life of a carbon-filled styrene–butadiene rubber (SBR. Microscopic mechanism of multiaxial fatigue of vulcanised natural rubber.
Plastics, Rubber and Composites40 (10), DOI: /Y 7th International Conference on Biaxial/ Multiaxial Fatigue and property and FCP effects previously undefined for rubber compounds. The effects of five major variables, and their interactions.
Numerical and experimental aspects of rubber fatigue crack initiation are investigated in this study. A parameter based on the strain energy density (SED) and predicting the onset of primary crack and its probable orientation was identified for such materials according to the investigations of Mars and a last work, we have analytically developed this criterion for simple tension (UT.
This paper aims to discuss the state of the art of rubbers multiaxial fatigue criteria. The capability of the continuum damage mechanics based model to estimate the elastomers fatigue life under multiaxial loading is checked using a set of constant amplitude multiaxial fatigue tests conducted on a carbon-black filled styrene-butadiene rubber (SBR).
As can be observed, the stress–strain curve of an equi-biaxial test results in a similar ‘S’ shaped configuration to that seen in typical uniaxial tensile tests on rubber compounds and the maximum strain at failure of the sample was approximately %.
Download: Download full-size image; Fig. Stress versus stretch ratio from a quasi. Zine A., Benseddiq N., Nait-Abdelaziz M., Ait Hocine N. () Prediction of Rubber Fatigue Life under Multiaxial Loading.
In: Gdoutos E.E. (eds) Fracture of Nano and Engineering Materials and Structures. durable rubber compounds, rubber components and systems that rely upon rubber components.
Second, the analysis and prediction of fatigue failure in rubber components depends on a quan-titative understanding of these factors. Finally, it should be acknowledged that many aspects of the fatigue failure process remain incompletely understood.
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): White reinforcement fillers such as precipitated silica inclusions are traditionally used in order to increase tear resistance and reduce internal heating of technical rubber components. In this work, two precipitated silicas, which essentially differ in their specific surface area, are incorporated into a natural.
Currently, the prediction of the fatigue life of rubber materials faces two major difficulties. On the one hand, it is necessary to obtain a precise value of the stresses, strains and strain energies of the entire component to be analyzed, throughout the complete load history [25,26].In order to do so, it is necessary to carry out the appropriate simulations using a sufficiently precise model.
mechanical properties of natural rubber compounds and apply those effects to the life prediction of off axis 2-ply cord rubber laminates. The work examined both the quasi-static and dynamic mechanical properties of two natural rubber vulcanizates, which had been subjected to isothermal anaerobic aging.
Two multiaxial fatigue damage models are proposed: a shear strain model for failures that are primarily mode II crack growth and a tensile strain model for failures that are primarily mode I crack growth. The failure mode is shown to be dependent on material, strain range and hydrostatic stress state.
After an introductory chapter, Part One reviews developments in ways of modelling composite fatigue life. The second part of the book reviews developments in predicting composite fatigue life under different conditions including constant and variable amplitude loading as well as multiaxial.
The process of fatigue failure of rubbers is generally described by two phases: crack initiation and crack propagation. This study concerns the crack initiation in such materials submitted to a cyclical loading.
Concerning this aspect, either. Natural rubber is a product coagulated from the latex of the rubber tree, hevea brasiliensis. Natural rubber features low compression set, high tensile strength, resilience, abrasion and tear resistance, good friction characteristics, excellent bonding capabilities to metal substrate, and good vibration dampening characteristics.
The process of fatigue failure of materials is generally described by two phases: crack initiation and crack propagation.
This study concerns the crack initiation in rubbers submitted to a cyclic loading. A parameter based on the strain energy. 6 Multiaxial and Thermomechanical Fatigue - Scope • Materials (metallic alloys, polymers, ceramics, composites, and materials with coatings) – Structural alloys for aerospace applications (uncoated) • Fatigue crack initiation and fatigue crack growth – Fatigue crack initiation • Low-cycle versus high-cycle fatigue – Low-cycle fatigue (primarily strain-based approaches).This book covers the fatigue testing of specimens, curve fitting of equations to the test data, and the use of such equations in life prediction.
Earlier chapters are background in the nature of rubber, history of its usage, brief mention of types of rubber and manufacturing methods.This study aims to investigate the effect of carbon black structures on the mechanical properties of industrial tyre rubber compounds containing Natural Rubber (NR) and Styrene Butadiene Rubber (SBR).
Different carbon black structures were used and characterised with respect to their rheological and physical was found that the NR compound containing high structure black, i.e.