2 edition of Effect of formation on local strain fields and fracture of paper. found in the catalog.
Effect of formation on local strain fields and fracture of paper.
Louis Man Chu Wong
Thesis (M.A.Sc.) -- University of Toronto, 1995.
|Series||Canadian theses = -- Thèses canadiennes|
|The Physical Object|
|Pagination||2 microfiches : negative. --|
The effect of the width of the fracture gapon tissue deformation. Assuming a relative movement of the two fracture surfaces of 10 μm, the cell in the smaller (10 μm) wide gap is disrupted (% strain) while the cells in the larger (30μm) wide gap are less deformed (~30%) and remain intact. TheFile Size: 5MB. The enhanced fracture resistance in rubber-like materials has often been attributed to the phenomenon of strain induced crystallization. For this study, a multi-scale polymer network model of the phenomenon coupled with phase ﬁeld fracture is proposed. At the microscopic scale, a new polymer chain model.
literature on damage and fracture is limited. In particular, the effects of temperature and strain rate on damage and fracture remain unexplored. The purpose of this study is to investigate this effects on damage accumulation to fracture in a magnesium alloy. Twin roll cast magnesium plates of AZ31B were used to that end. An extensive experimental. 1. J Sports Sci. Summer;5(2) Bone dynamics: stress, strain and fracture. Martin AD(1), McCulloch RG. Author information: (1)Sport and Exercise Sciences Research Institute, University of Manitoba, Winnipeg, Canada. Bone is a dynamic tissue whose functional mass is controlled by the balance between the endocrine drive towards bone resorption and the mechanically-engendered drive Cited by:
indicate new en echelon fracture d-c-e and sites of initiation of two subsequent en echelon fractures f and g. In D, fault zone propagates to fracture d-c-e and activates it as a wing crack. Each long extension fracture propagates through a series of individual bond failures at fracture tips. Particles not shown in E (White et al. figure 5). Linear elastic fracture mechanics A large ﬁeld of fracture mechanics uses concepts and theories in which linear elastic material behavior is an essential assumption. This is the case for Linear Elastic Fracture Mechanics (LEFM). Prediction of crack growth can File Size: 1MB.
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Even though formation has an obvious effect on the mechanical properties of paper, no precise one-to-one relationship exists between the local basis weight and strain fields in any given paper specimen. There are two reasons for this.
First, variation in basis weight does not in itself account for variations in net-work structure. The degree of. The aim of this paper is to give an accurate description of the evolution of the lattice rotation and of the local strain fields and also to determine velocity strain and rotation fields, within grains of a polycrystal submitted to a monotonous deformation.
An empirical extension of the stress-state dependent Hosford–Coulomb fracture initiation model is proposed to account for the effect of strain rate on the onset of ductile fracture. The model is subsequently calibrated and successfully validated using the results from fracture experiments on DP and TRIP steels.
Two different kinds of papers were examined: a low-density paper (LDP) and a high-density paper (HDP). Fig. 3 shows micrographs that were recorded in transmission mode on both papers, using an optical microscope equipped with a camera (pixel size × µm 2).For the LDP, the darker areas corresponded to zones that were denser compared to the rest of the sample due to high variation in Cited by: 3.
The aim of our paper is to formulate theoretical foundations and to pro-pose an outline of a new methodology to account for the eﬀect of strain rate on ductile fracture phenomena.
The inﬂuence of the multi-scale hierarchy of shear bands which develop during advanced plastic strains is described by me. Effect of strain rate on ductile fracture initiation in advanced high strength steel sheets: Experiments and modeling Christian C.
Rotha, Dirk Mohra,b,⇑ a Solid Mechanics Laboratory (CNRS-UMR ), Department of Mechanics, École Polytechnique, Palaiseau, France bImpact and Crashworthiness Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, File Size: 6MB.
Recent studies on local stress fields in proximity of crack and notch tips have shown that Strain Energy Density (SED), averaged in a circular control volume surrounding the point of stress.
This paper investigated the effects of strain rate on fracture behavior of human cortical bone using a nonlinear fracture mechanics based cohesive finite element model (Ural and Vashishth, b, b, a).
The simulations focused on determining the change in initiation and propagation toughness with strain rate via 2D and 3D μCT-based compact Cited by: A hypothesis for the time-dependent mechanisms underlying the mechanical behavior of commercial bond paper, a fibrous material, is proposed based on an examination of the fracture morphology.
Machine-made bond paper has preferred directions due to the dominant fiber orientation, and the mechanisms differ depending on the orientation of the Cited by: Effects of microstructure on crack tip fields and fracture toughness in PC/ABS polymer blends Article (PDF Available) in International Journal of Fracture (3) October with Reads.
The mechanical properties of DP dual phase steel were measured by quasi-static and high-speed tensile tests at strain rates between and s−1 at room temperature. The deformation and fracture mechanisms were analyzed by observation of the tensile fracture and microstructure near the fracture.
Dynamic factor and feret ratio quantitative methods were applied to Cited by: Strain Theory and Fracture Healing. Perren 7,8 introduced the importance of strain in fracture healing. Fracture gap strain is defined as the relative change in Cited by: varibles I).OPEN FRACTURES: Severe open fractures cause soft tissue disruption, fracture displacement, and, in some instances, significant bone loss.
Extensive tearing or crushing of the soft tissue disrupts the blood supply to the fracture site, leaving necrotic bone and soft tissue, impeding or preventing formation of a fracture. oscilloscope during the fracture test; it is also used for static rnonitor– ing before and after the test.
Static Strain Gage - SR-4 Type Al (l-in. gage length)or A7 l/4-in. strain gage used only to monitor the static strain level. Component Strain Gage – One of the three individual strain gages of. A simple theoretical model for predicting the effect of tensile pre-strain on fracture toughness has been developed using the local approach.
The HRR singularity is assumed to describe the stress-strain field around the crack by: configuration showed different effect in the stress-strain experirnents. Using histological data on skin, Daly () explained its stress-strain behaviour.
The fracture behaviour was studied using SEM. Figure 2 shows the mode of fracture of skin at the lowest strain rate. Ductile and Brittle Strain. Earth’s rocks are composed of a variety of minerals and exist in a variety of conditions.
In different situations, rocks may act either as ductile materials that are able to undergo an extensive amount of ductile strain in response to stress, or as brittle materials, which will only undergo a little or no ductile strain before they fracture.
The paper at hand presents a novel approach within the framework of phase‐field models for brittle fracture. A rate‐dependent fracture toughness is formulated as a function of the rate of crack driving strain components, which results in higher strength for faster by: 2. The present investigation was undertaken as a preliminary study into the influence of strain rate on the forming limit diagram for low carbon steel.
For a variation in strain rate from 10 −3 s −1 to 70 s −1 experiments have shown that, in the positive quadrant of the forming limit diagram, the position of the forming limit curve is Cited by: Influence of Strain Rate and Temperature on Deformation and Fracture Behaviour of Magnesium Alloy MgAl8Zn: Tests and Numerical Simulations.
El‐Magd. Department of Materials Science, RWTH Aachen, Germany. Search for more papers by this author. by: 2. Abstract: In this paper, dynamic fracture process and strain rate effect of a porous SiC ceramic were investigated. The failure process under dynamic loading conditions was monitored by a high‐speed camera.
Digital image correlation (DIC) method was further utilized to calculate the surface strainAuthor: Yanpei Wang, Ding Zhou, Huifang Liu, Sheikh Muhamamd Zakir, Yulong Li.The primary task of automotive industry materials is to guarantee passengers’ safety during a car crash.
To simulate a car crash, the influence of strain rates on mechanical properties and fracture behavior of medium Mn steels with different Si content (0Si without δ-ferrite and Si with about 20% δ-ferrite) was conducted using the uniaxial tensile : Zheng Wang, Juanping Xu, Yu Yan, Jinxu Li.The next step is to study the effect of the prestrain history on subsequent deformation and fracture behaviour.
It is known that plastic deformation will not only modify the yield and strain hardening behaviour, but will also inﬂuence in a detrimental manner the local failure mechanisms, the initiation toughness and fatigue properties [1–9].