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Monday, August 10, 2020 | History

2 edition of experimental study of thickness effects on plastic strain concentration. found in the catalog.

experimental study of thickness effects on plastic strain concentration.

E R. Welbourne

experimental study of thickness effects on plastic strain concentration.

by E R. Welbourne

  • 341 Want to read
  • 17 Currently reading

Published by National Research Council of Canada in Ottawa .
Written in English


Edition Notes

SeriesLaboratory technical reports -- ST. 433.
The Physical Object
Pagination17p.
Number of Pages17
ID Numbers
Open LibraryOL13727233M

machines and notch effects have been a key problem in the study of fatigue. The degree of stress and strain concentration is a factor in the fatigue strength of notched parts. The localized plastic deformation and notch blunting effect due.   At each position exceeding the yield, a maximum of strain is observed for 3–6 elements, each with a size of mm. The quantitative plastic strain of each element is shown in Figure The occurrence of the plastic strain is observed mainly in the spiral notch region, where the upper and lower plates are connected.

Phase transformations (PTs) under high pressure and plastic shear are widespread in nature, physical experiments, and modern technologies. In order to study the effect of plastic deformations on PTs, a rotational diamond anvil cell (RDAC) and diamond anvil cell (DAC) without hydrostatic media are utilized, in which large plastic shear is superposed in the sample under high pressure. The effects of a discontinuity in a brittle material are very much different than in a ductile material. With these materials, no stress relieving plastic flow action is possible and the full value of the stress concentration is valid right up to the fracture strength. For.

Krempl 8 presented plastic strain and stress concentration factors for notched specimens (nominal Kt - 3) of carbon steel, Cr-l Mo alloy steel, and type stainless steel from which geometric means could be computed. The calculated discrepancy between the geometric mean of the plastic stress and strain . There are experimental methods for measuring stress concentration factor including photoelastic stress analysis, brittle coatings or strain gauges. While all these approaches have been successful, all also have experimental, environmental, accuracy and/or measurement disadvantages.


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Experimental study of thickness effects on plastic strain concentration by E R. Welbourne Download PDF EPUB FB2

The following section, which consists of a comparison between modelling results and experimental measurements will only focus on slip data, which removes the effects of plastic strain concentration in the thickness of the adhesive. by:   Effect of sheet thickness and grain size on limit-strains in biaxial stretching TABLE I.

RELATION OF CRITICAL AMPLITUDE OF SURFACE ROUGHNESS WITH SHEET THICKNESS AND STRAIN HARDENING IN EQUIBIAXIAL STRETCHING, FOR BRASS tO m do tam Rtmc ~m l-fc ~GC (~o) ~'c MPa 1-fe/(~-ae)c x IOg 35 o.g7 0,5 35 Cited by:   In case of one clamp (Fig.

10 a, c), the strain concentration at the lower tool was captured, but the line then continues mostly outside of the band with elevated strain levels.

With two clamps (Fig. 10 b, d) the line mostly experimental study of thickness effects on plastic strain concentration.

book with the high strain band, especially for the h and h by: 2. Experimental study of strain rate effects on the strength of adhesively bonded joints after hygrothermal exposure.

m where the material flow stress σ ¯ is a function of plastic strain rate Joint fracture is resulted by the stress concentration at the edges of the overlap area.

The LT model was then used to predict the stress states of Cited by:   Inhomogeneous deformation occurs and the distribution of plastic strain becomes non-uniform along the gauge length. This leads to the large strain concentration at the fracture region.

In addition, the size of material flaws is not scaled down with the specimen thickness. Principe, J.W. WangAn experimental study on size effects on flow Cited by: The understanding of fatigue crack closure has been proved to be a challenging and controversial topic among the fatigue community over the last three decades.

The effect of the specimen (or component) thickness has been shown to have a significant effect on closure behaviour and this seems to be related to the relative size of the plastic zone.

This study is concerned with the synergistic effects of multiple holes on the stress concentration in isotropic plates the strain concentration and then stress is calculated. EXPERIMENTAL Materials Stress concentration investigation on rectangular plates with. r, as the strain at which the experimental curve deviates from the theoretical curve by We have verified that for our films this strain indeed corresponds to the strain at which cracks start to initiate on a large scale [27, 28].

With this definition, we can plot the failure strain as a function of film thickness. The elastic and elastic-plastic surface strain fields around circular holes drilled at various skew angles to a flat plate have been experimentally evaluated in uniaxial tension.

A photoelastic coating and moiré technique were used in the low- and high-strain regions, respectively. The maximum strain-concentration factor is shown to increase markedly with horizontal skew angle and decrease.

This paper introduces an experimental study on draw bead effects on aluminum sheet metals by measuring the forming limit strain zero (FLD0) of the sheet metal. Two kinds of aluminum, AL T4. In this study, the effects of thickness of the.

The effective plastic strain ra te in the simulations was for both materials which. as well as experimental study, was carried out on.

The experimental databases on the effects of strain rates are available in the literature [31]. It is recognised that the strain rate varies with different locations of the colliding bodies, which. Swedlow, J. L.: The thickness effect and plastic flow in cracked plates. Aerospace Research Laboratories, Office of Aerospace Research, U.S.

Air Force, Wright. The low in-plane constrain t effect has been studied using specimens with shallow cracks [27][28][29], whereas specimens with reduced thickness have been employed to study the effect of low out-of.

Abstract: Abstract. The elastic stress and strain fields of plates containing one central hole and two auxiliary holes subjected to uniaxial tension are examined using finite element method. The interaction between holes and the thickness effect on stress and strain concentration factors are investigated.

The influential parameters on the LCF such as the specimen thickness, strain ratio and cryogenic temperature were considered in this experimental study. In order to investigate the thickness. In this study, a different issue of mechanical engineering interests is determined for threaded fastened joints.

A series of photoelastic experiments were performed to determine the maximum strains for the holes in a tensile flat plate subjected to bolt-nut loads. Pertinent strain distributions were examined to determine the roll of the torques on the bolts in mini mizing the strain; hence.

Photoelasticity describes changes in the optical properties of a material under mechanical deformation. It is a property of all dielectric media and is often used to experimentally determine the stress distribution in a material, where it gives a picture of stress distributions around discontinuities in materials.

Photoelastic experiments (also informally referred to as photoelasticity) are an. Although detailed shell analysis is suitable to predict the ductile crack initiation life of steel members, such detailed method adds time expense and complexity.

In order to simply predict the ductile crack initiation life of stiffened steel bridge piers, a total of 33 cases are simulated to carry out the parametric analyses.

In the analysis, the effects of the width-to-thickness ratio. Serensen, A. Romanov, and M. Gadenin, “Effect of structural nonuniformity on the development of plastic strain under low-cycle loading,” in: Structural Factors in the Low-Cycle Fracture of Metals [in Russian], Nauka, Moscow (), p.

Google Scholar Download references. For the case of a larger plastic strain of % as plotted in Figure 11 b, the effect of k 2 is much more significant.

With the relatively lower k 2 of10, annihilation is not pronounced and resulted in an increase of the ρ ¯ SSD. At % of plastic strain, ρ ¯ GND does not exceed ρ ¯ SSD. In welding process, the residual stress magnitude based on the inherent strain or plastic strain, so the analysis of strain behavior is important to characterize the minimization of residual stress.

In the work done by (soul & yan hua,) the transient longitudinal plastic strain profiles were analyzed at two nodes and presented in figure Bushelow, M. and Oh, I. () The effect of acetabular cup polyethylene thickness upon cement mantle strain: an in vitro strain gauge study.

11th Annual Meeting of Society of Biomaterials, San Diego, p. Google Scholar.