A discussion of paper “A novel indirect tensile test method to measure the biaxial tensile strength of concretes and other quasibrittle materials” by G. Zi, H. Oh, S.K. Park

2010 ◽  
Vol 40 (12) ◽  
pp. 1769-1770 ◽  
Author(s):  
Ozgur Ekincioglu
Keyword(s):  
Tensile Strength ◽  
Tensile Test ◽  
Test Method ◽  
Indirect Tensile Test ◽  
Quasibrittle Materials ◽  
Biaxial Tensile ◽  
Indirect Tensile

scholarly journals Indicadores do desempenho de misturas asfálticas determinados através do ensaio de compressão diametral

TRANSPORTES ◽  
2008 ◽  
Vol 16 (1) ◽  
Author(s):  
Lélio Antônio Teixeira Brito ◽  
Jorge Augusto Pereira Ceratti ◽  
Daniel Ramos Victorino
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fatigue Life ◽  
Cyclic Loading ◽  
Tensile Test ◽  
Resilient Modulus ◽  
Phase Lag ◽  
Asphalt Mixes ◽  
Indirect Tensile Test ◽  
Indirect Tensile

<p>Os ensaios de compressão diametral são amplamente usados no Brasil para determinação das propriedades mecânicas de misturas asfálticas, tanto através de ensaios monotônicos para determinação da resistência à tração, quanto sob carregamentos cíclicos para determinação do módulo de resiliência e da vida de fadiga. Este trabalho teve como objetivo mostrar que com instrumentação adequada destes ensaios, indicadores adicionais àqueles usualmente determinados podem ser obtidos. A energia mobilizada durante o ensaio de resistência à tração, bem como o monitoramento da rigidez ao longo do ensaio de fadiga e a defasagem medida entre o pulso de carga e o deslocamento no ensaio de módulo de resiliência, mostram-se promissores para este propósito.</p><p><em><strong>Abstract</strong> Indirect tensile test (IDT) are broadly used in Brazil for the assessment of mechanical properties of asphalt mixes, not only under monotonic loading to determine the tensile strength, but also under cyclic loading to determine resilient modulus and fatigue life. This study tries to demonstrate that with adequate instrumentation of these tests, additional indicators to those usually determined are possible to be obtained. The mobilized energy during the IDT test, as well as the monitoring of the stiffness during the fatigue test and the phase lag measured between load and displacement pulses in the resilient modulus test are promising for this purpose. </em></p>

Mechanical behavior of reinforced concrete with waste-tire particles under an indirect tensile test

MRS Advances ◽  
2019 ◽  
Vol 4 (54) ◽  
pp. 2931-2937
Author(s):  
Sandra L. Rodríguez R. ◽  
Luis S. Hernández H. ◽  
Francisco G. Pérez-Gutiérrez. ◽  
Jorge H. Díaz A
Keyword(s):  
Tensile Strength ◽  
Tensile Test ◽  
Mechanical Behavior ◽  
Compression Strength ◽  
Fine Aggregate ◽  
Indirect Tensile Test ◽  
Waste Tire ◽  
Concrete Properties ◽  
Waste Rubber ◽  
Indirect Tensile

ABSTRACTThe incorporation of triturated tire particles as an aggregate in the concrete mixture is one of the ways to take advantage of this Waste Rubber (WR) in order to improve concrete properties, such as mechanical behavior. In this research we evaluated mechanical behavior of concrete specimens prepared with different amounts WR, which partially substituted the fine aggregate, under an indirect tensile test. In contrast with other’s researcher’s findings, our results show that the specimens with 5% WR present the highest value of indirect tensile strength (TP) of 4.36 MPa. Polynomial relationships between TP and compression strength (f´c), where Tp ranges from 0.1f´c to 0.2f´c. Specimens with the 0, 5 and 10% WR content show two types of failure: normal tension and tiple-cleft failure, described in the norm ASTM 1144-89. Nevertheless, specimens with 15 and 20% WR show a new failure not described in the norm, which is thought to be occurring due to the high amount of WR used.

scholarly journals Calculation Derivation and Test Verification of Indirect Tensile Strength of Asphalt Pavement Interlayers at Low Temperatures

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6041
Author(s):  
Qian Zhang ◽  
Zhihe Fang ◽  
Yiheng Xu ◽  
Zhao Ma
Keyword(s):  
Tensile Strength ◽  
Tensile Test ◽  
Asphalt Pavement ◽  
Indirect Tensile Strength ◽  
Elastic Theory ◽  
Calculation Formula ◽  
Indirect Tensile Test ◽  
Indirect Tensile ◽  
Direct Tensile ◽  
Direct Tensile Test

When the direct tensile test is adopted to determine the interlayer tensile strength of the asphalt pavements, specimen separation or internal cracking often occurs at the bonding area of the loading head, rather than at the interlaminar bonding interface. In view of the tedious and discrete data of the direct tensile test, this paper attempts to introduce an indirect tensile test to determine the interlayer bond strength of asphalt pavement to solve this problem. However, the indirect tensile test method of a binder lacks the corresponding mechanical theory. This paper deduces the calculation formula of the indirect tensile strength of a binder based on elastic theory. A mechanical model of the test was established with the finite element method. In accordance with the two-dimensional elastic theory and the Flamant solution, an analytical solution of tensile stress in the indirect tensile test is proposed through the stress superposition. On this basis, the calculation formula for the indirect tensile strength of the interlaminar bonding is derived according to Tresca’s law. A low-temperature indirect tensile test was designed and conducted to verify the correctness of the formula. By comparing the results of the indirect tensile test and direct tensile test, it is found that the interlaminar strength of the mixture measured by them is similar, and the dispersion of indirect tensile test results is small. The results show that the indirect tensile test can replace the direct tensile test to evaluate the interlaminar tensile strength.

scholarly journals A Comparative Study of the CMT+P Process on 316L Stainless Steel Additive Manufacturing

2020 ◽  
Vol 10 (9) ◽  
pp. 3284 ◽  
Author(s):  
Bin Xie ◽  
Jiaxiang Xue ◽  
Xianghui Ren ◽  
Wei Wu ◽  
Zhuangbin Lin
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Additive Manufacturing ◽  
Tensile Test ◽  
Heat Dissipation ◽  
316L Stainless Steel ◽  
Single Channel ◽  
Steel Wire ◽  
Energy Dispersive Spectrometer ◽  
Test Method

Adopting the cold metal transfer plus pulse (CMT + P) process, 316L stainless steel wire was treated with a single channel multi-layer deposition experiment under different linear energy. The microstructures of different regions on the deposited samples were observed by optical microscope and scanning electron microscope, and the element distribution in the structure was analyzed by energy dispersive spectrometer. The mechanical properties and microhardness were measured by tensile test method and microhardness tester, respectively, and the anisotropy of tensile strength in horizontal and vertical directions were calculated. Finally, the fracture morphology of the tensile samples were observed by SEM. Experiment results showed that when the difference between the actual and the optimal wire feeding speed matching the specific welding speed was too large, this led to an unstable deposition process as well as flow and collapse of weld bead metal, thus seriously deteriorating the appearance of the deposition samples. The results from metallographic micrograph showed that rapid heat dissipation of the substrate caused small grains to generate in the bottom region of deposition samples, then gradually grew up to coarse dendrites along the building direction in the middle and top region caused by the continuous heat accumulation during deposition. Tensile test results showed that with the increase of linear energy, the horizontal and vertical tensile strength of the as-deposited samples decreased. In addition, the higher linear energy would deteriorate the microstructure of as-deposited parts, including significantly increasing the tendency of oxidation and material stripping. The microhardness values of the bottom, middle and top regions of the samples fluctuated along the centerline of the cross-section, and the values showed a trend of decreasing first and then rising along the building direction. Meanwhile, the yield strength and tensile strength of each specimen showed obvious anisotropy due to unique grain growth morphology. On the whole, the results from this study prove that CMT+P process is a feasible MIG welding additive manufacturing method for 316L stainless steel.

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