نتایج جستجو برای: shear strength parameters
تعداد نتایج: 823030 فیلتر نتایج به سال:
introduction :the aim of this study was to evaluate and compare the in vitro effect of the erbium-doped yttrium aluminum garnet (er:yag) laser with different radiation distances and high-speed rotary treatment on the shear bond strength of flowable composite to enamel of human permanent posterior teeth . methods : freshly extracted human molar teeth with no caries or other surface defects were ...
تأثیر ناهمسانی مکانیکی و ناهمگونی پارامترهای مقاومت برشی خاکها بر ظرفیت باربری دراز مدت پیهای سطحی
Natural formation of soil deposits causes heterogeneity and anisotropy in their strength and stiffness properties. However, most soils in their natural states exhibit some anisotropy with respect to shear strength and heterogeneity with respect to the depth. In this paper, the standard Mohr- Coulomb constitutive law is generalized to anisotropic version in order to consider the effect of cohesi...
In this research, the effect of standoff distance and explosive material thickness on metallurgical features of explosive welding connection of copper to 304 stainless steel has been investigated. Experimental analysis were performed using optical microscopy, scanning electron microscopy, microhardness test and tensile shear strength test. The results indicated that due to severe plastic deform...
Background and Aim: Evaluation of shear bond strength and microleakage of bonding agents is important as these properties play main roles in adhesion of composite to dental tissues. Microleakage results in bacterial penetration into dentin tubules and enamel surfaces and causes sensitivity and recurrent caries followed by destruction of composite filling. Insufficient shear bond strength result...
geotechnical investigations of waste fills are rarely undertaken, and consequently the geotechnical community has little knowledge of their engineering properties. in this study, a geotechnical testing program was conducted to evaluate the engineering properties of old municipal solid waste sampled in whamyung msw landfill site, busan, korea. the conducted tests included water content, specific...
the aim of this study was to compare the shear bond strength (sbs) of resin modified glass ionomer (rmgi) and composite resin for bonding metal and ceramic brackets.eighty-eight human premolars extracted for orthodontic purposes were divided into 4 groups (n=22). in groups 1 and 2, 22 metal and ceramic brackets were bonded using composite resin (transbond xt), respectively. twenty-two metal and...
Effects of annealing treatment after equal channel angular pressing (ECAP) on the interface properties and shear bond strength of Al/Cu bimetallic rods were investigated. For the as-deformed samples, the one with two passes of ECAP indicated higher shear bond strength. Formation of a layer of intermetallic compounds after annealing treatment is confirmed. In general, by increasing annealing tem...
In this study, the cyclic behaviors of low rise concrete shear walls using recycled coarse or fine aggregates were investigated. Eight low rise Recycled Aggregates Concrete (RAC) shear wall specimens were designed and tested under a cyclic loading. The following parameters were varied: replacement percentages of recycled coarse or fine aggregates, reinforcement ratio, axial force ratio and X-sh...
The joint surface is widely distributed in the rock, thus leading to the nonlinear characteristics of rock mass strength and limiting the effectiveness of the linear model in reflecting characteristics. The JRC/JCS model is the nonlinear failure criterion and generally believed to describe the characteristics of joints better than other models. In order to develop the numerical program for JRC/...
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