دانلود رایگان مقاله لاتین اثر barreling در حین انجام آزمایش فشار از سایت الزویر
عنوان فارسی مقاله:
اثر barreling در حین انجام آزمایش فشاری محوری نمونه مکعبی با خواص الاستیک همسانگرد، متقاطع همسانگرد و ناهمسانگرد
عنوان انگلیسی مقاله:
Effects of barrelling during axial compressive tests of cubic samples with isotropic, transversely isotropic and orthotropic elastic properties
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The determination of stiffness properties of orthotropic materials can be challenging. In the careful design of wood structures, the full orthotropic set of elastic parameters is needed [1], e.g. for the finite-element modelling of wood joints that are locally subjected to a triaxial stress state. Compressive experiments are generally considered to be a reliable method of determining engineering constants such as compressive strength, Young's moduli and Poisson's ratios. The general approach is to measure the material response due to an applied force. The procedure is straightforward and easy to perform due to the simplicity of the experimental installation and low demands on sample geometry. The ASTM D-143 standard [2,3] requires the usage of elongated rectangular prisms for the compressive testing together with strain gauges. For rare materials such as archaeological wood as exemplified in Fig. 1(a), it is more convenient to use cubic samples [4,5] to save material, since the same sample can be tested several times in different directions (typically radial, tangential, longitudinal) if the loads are applied within the elastic range and do not cause irreversible damage to the material. A disadvantage of compressive testing a cube rather the tensile testing of a dog-bone sample is that it can be difficult to ensure a homogeneous stress state due to geometrical imperfections in the sample [6]. Moreover, barrelling (as illustrated in Fig. 1(b, c)) during compressive loading [7], caused by friction between the platens and the sample makes it difficult to assess the non-uniform deformation in order to determine the elastic parameters, and the Poisson's ratios cannot be obtained directly under such constraints. The most common way to measure strain is by using either the loading platen position or electricalresistance strain gauges. Nowadays, full field strain measurement techniques such as 3D/stereo-digital image correlation (DIC) [8], virtual fields method [9] and digital volume correlation [10] are increasingly being used. The strain-field measurement technique using DIC has been shown to possess advantages in comparison with the traditional strain gauges [11e13]. In particular, full-field measurements can help to improve the estimation of the stiffness parameters [8,14,15]. Despite technical difficulties in obtaining accurate elastic properties from the compressive testing of wooden cubes, it is still a reasonable choice of test method if the amount of * Corresponding author. available material is limited, as is the case for e.g. archaeological
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کلمات کلیدی:
Advances in Site Investigation Practice: Proceedings of the ... https://books.google.com/books?isbn=0727725130 C. Craig, Institution of Civil Engineers (Great Britain) - 1996 - Technology & Engineering 2 shows the result of consolidated undrained cyclic triaxial tests applying ... The compressive strength of the sample from a consolidated undrained (CU) TC test ... was isotropically consolidated to ov'(in-situ)= 64 kPa and the external axial strain rate was 0.01 %/min. ... motion of the core barrel during coring was unlikely. Materials | Free Full-Text | Experimental and Numerical Evaluation of ... www.mdpi.com/1996-1944/9/5/398/htm by O Andersen - 2016 - Cited by 1 - Related articles May 21, 2016 - Former compression tests performed on other sintered short fiber structures ... Photographs of the quasi-static sample deformation in dependence of the ... no barreling, but a layer-wise collapse mechanism, leading to lower yielding ..... for cube-shaped samples for dynamic testing; and (d) photograph of ... Engineering Materials Science: Properties, Uses, Degradation, ... https://books.google.com/books?isbn=1782420495 H McArthur, D Spalding - 2004 - Technology & Engineering 3.3 COMPRESSION TESTING Brittle materials are generally tested in ... relevant parts of BS 1881 (Part 116: 1991 for cube compressive strengths). ... Necking (3.2.1) does not occur in compression; instead, the opposite (barrelling) occurs. ... Concrete compression tests involve placing well mixed concrete test samples in an ... Soft Soil Engineering - Page 594 - Google Books Result https://books.google.com/books?isbn=9026518668 A.K.L. Kwong, C.K. Lau, C.F. Lee - 2001 - Technology & Engineering In order to obtain high quality samples, ocean platform was used to reduce ... Moreover, the open-thin-barrel sampler of TB100A and stainless steel sampling tube of ... tests including physical properties, compressive deformation characteristics ... and deviator stress and axial strain under triaxial CU tests are plotted in Fig.l, ... Soil Mechanics and Geotechnical Engineering https://books.google.com/books?isbn=9058092356 D.L. Shah, A.V. Shroff - 2003 - Technology & Engineering 12.8.3 Unconfined Compression Test The unconfined compression test is a special ... test in which a cylindrical specimen is failed under the axial compressive stress ... When there are no lateral stresses, Oj = 0, in the equation = <T3 tan2 + 2 cu tan ... The sample is placed under a cone seating to reduce the tendency of the ... [PDF]Experimental procedure for determining "true stress - true strain" congress.cimne.com/eccomas/eccomas2000/pdf/770.pdf by MA Cavaliere - Cited by 3 - Related articles determine "true stress - true strain" curves via compression tests. ... independent of the sample barreling and therefore of the friction between the sample and the machine ... Figure 1: High temperature compression test in a Gleeble 3500 simulator ... Cu. Nb. Ti. V. N. B. 0.74. 0.5. 0.028. 0.017. 0.004. 0.0046. 0.001.
