Compressive stress effect on the loss mechanism in a soft piezoelectric Pb(Zr,Ti)O3

2019 ◽  
Vol 90 (7) ◽  
pp. 075001 ◽  
Author(s):  
H. Daneshpajooh ◽  
M. Choi ◽  
Y. Park ◽  
T. Scholehwar ◽  
E. Hennig ◽  
...  
Keyword(s):  
Compressive Stress ◽  
Stress Effect ◽  
Loss Mechanism

Compressive Stress Effect on the Radial Elastic Modulus of Oxidized Si Nanowires

Nano Letters ◽  
2010 ◽  
Vol 10 (6) ◽  
pp. 2031-2037 ◽  
Author(s):  
G. Stan ◽  
S. Krylyuk ◽  
A. V. Davydov ◽  
R. F. Cook
Keyword(s):  
Elastic Modulus ◽  
Compressive Stress ◽  
Stress Effect ◽  
Si Nanowires

Gap Test of Crack-Parallel Stress Effect on Quasibrittle Fracture and Its Consequences

2020 ◽  
Vol 87 (7) ◽  
Author(s):  
Hoang Thai Nguyen ◽  
Madura Pathirage ◽  
Gianluca Cusatis ◽  
Zdeněk P. Bažant
Keyword(s):  
Compressive Stress ◽  
Process Zone ◽  
Main Idea ◽  
Stress Effect ◽  
Test Beam ◽  
Simple Modification ◽  
Out Of Plane ◽  
Three Point Bend Test ◽  
Strength Models ◽  
Gap Test

Abstract In the standard fracture test specimens, the crack-parallel normal stress is negligible. However, its effect can be strong, as revealed by a new type of experiment, briefly named the gap test. It consists of a simple modification of the standard three-point-bend test whose main idea is to use plastic pads with a near-perfect yield plateau to generate a constant crack-parallel compression and install the end supports with a gap that closes only when the pads yield. This way, the test beam transits from one statically determinate loading configuration to another, making evaluation unambiguous. For concrete, the gap test showed that moderate crack-parallel compressive stress can increase up to 1.8 times the Mode I (opening) fracture energy of concrete, and reduce it to almost zero on approach to the compressive stress limit. To model it, the fracture process zone must be characterized tensorially. We use computer simulations with crack-band microplane model, considering both in-plane and out-of-plane crack-parallel stresses for plain and fiber-reinforced concretes, and anisotropic shale. The results have broad implications for all quasibrittle materials, including shale, fiber composites, coarse ceramics, sea ice, foams, and fone. Except for negligible crack-parallel stress, the line crack models are shown to be inapplicable. Nevertheless, as an approximation ignoring stress tensor history, the crack-parallel stress effect may be introduced parametrically, by a formula. Finally we show that the standard tensorial strength models such as Drucker–Prager cannot reproduce these effects realistically.

The compressive stress effect on the magnetostriction and magnetization for Sm-Dy-Fe composites

2012 ◽  
Vol 111 (7) ◽  
pp. 07A906 ◽  
Author(s):  
Bowen Wang ◽  
Zhihua Wang ◽  
Yanming Hao ◽  
Ling Weng ◽  
Wenmei Huang ◽  
...  
Keyword(s):  
Compressive Stress ◽  
Stress Effect

scholarly journals Analysis on stress state of box-girder web under prestressing effect

2018 ◽  
Vol 17 ◽  
pp. 03007
Author(s):  
Haijun Yin ◽  
Ziqing Li ◽  
Xianwu Hao ◽  
Baojun Zhao
Keyword(s):  
Tensile Stress ◽  
Compressive Stress ◽  
Cross Section ◽  
Neutral Axis ◽  
Curved Beam ◽  
Stress Effect ◽  
Box Girder ◽  
Principal Tensile Stress ◽  
Bending Radius ◽  
The Web

In order to study the effect of prestressed box girder webs stresss state, determining the stress distribution within a web, research and analysis of vertical prestressed box girder, curved beam prestressed sensitivity under the web. Establishing the finite element model of the box girder web vertical prestressing effect is analyzed, results show that the principal tensile stress of the web is sensitive to the vertical prestress, applying the vertical prestress can effectively reduce the principal tensile stress of the web; with the decrease of the effective vertical prestress, the neutral axis above the principal compressive stress decreases rapidly, while below the neutral axis decreases relatively slow; Under the same vertical preloading stress level, the roots of cross section of the compressive stress of web reserves than L / 4 section of the web. Calculation and analysis of curved beam under bending point, different bending angles and bending radius of principal stress effect on the web, Results show that the set of curved beam web when the curved beam bending stress concentration easily, appear the main tensile stress; Increase the bending radius can effectively reduce beam cross-section of web principal tensile stress, along with the rising of the next corner, principal tensile stress peak value increases gradually, thus setting bending beam, should try to reduce the bending angle.

Analysis of Failure Mode of Masonry Wall under Vertical Compressive Stress

2012 ◽  
Vol 193-194 ◽  
pp. 791-795
Author(s):  
Hui Hui Zhao ◽  
Wen Fang Zhang
Keyword(s):  
Finite Element ◽  
Compressive Stress ◽  
Failure Mode ◽  
Masonry Wall ◽  
Shear Capacity ◽  
Brick Masonry ◽  
Wall Structure ◽  
Stress Effect ◽  
Element Analysis ◽  
Finite Element Software

The application of ABAQUS finite element software non-linear finite element analysis of brick masonry walls with structural column. Build three brick masonry wall models, and analysis of the damage form of the wall under different vertical compressive stress and horizontal force. Thus the analysis result compared with the calculation result of the relevant specification formula, in order to get validate compression influence of masonry aseismic walls. It turned out that different vertical compressive stress effect the shear capacity, and failure mode of brick masonry wall structure with a structural column.

Transverse compressive stress effect in Y-Ba-Cu-O coatings on biaxially textured Ni and Ni-W substrates

2003 ◽  
Vol 13 (2) ◽  
pp. 3530-3533 ◽  
Author(s):  
N. Cheggour ◽  
J.W. Ekin ◽  
C.C. Clickner ◽  
D.T. Verebelyi ◽  
C.L.H. Thieme ◽  
...  
Keyword(s):  
Compressive Stress ◽  
Stress Effect

Study of Pre-Stress Effect of Ribcage Structure on Chest Response of Crash Dummy Model

2010 ◽  
Author(s):  
Xinghua Lai ◽  
Qing Zhou
Keyword(s):  
Stress State ◽  
Tensile Stress ◽  
Compressive Stress ◽  
Fe Model ◽  
Stress Effect ◽  
Stress Model ◽  
Test Results ◽  
Hybrid Iii ◽  
Structural Responses ◽  
Stress States

Assembling induced pre-stress state commonly exists in the ribcage structure of Hybrid III dummy hardware. In the practice of dummy modeling, however, the pre-stress issue is often neglected. This study is intended to assess the pre-stress effect on chest response of the Hybrid III 50th percentile male dummy model. In this paper, how the pre-stress state is generated in the dummy ribcage assembling process is first elaborated by disassembling and reverse engineering a physical dummy chest structure. A thorax FE model is then built and validated against test results. Using finite element modeling approach, the structural responses with and without the pre-stress state are compared and analyzed at single rib, ribcage and full dummy levels and under a number of loading conditions. The study has found out that, there are two common pre-stress states existing in the rib components of the dummy ribcage, pre-compressive stress and pre-tensile stress. Compared with no pre-stress model, the pre-compressive stress makes a rib stiffer and the pre-tensile stress makes a rib less stiff. It is further concluded that, the pre-stress effect is significant at the single rib level and insignificant at the ribcage level and the full dummy level. This is mainly because the effects of the pre-compressive stress and the pre-tensile stress existing in the six ribs are compensated each other in the assembled ribcage. Therefore, neglecting the pre-stress effect of the ribcage structure in the dummy models is reasonable.

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