Thermoplastics valves. Fatigue strength. Test method

2015 ◽  
Keyword(s):  
Fatigue Strength ◽  
Strength Test ◽  
Test Method

Research on the Fatigue Strength Test of 20CrMnMo Carburized and Quenched Gears

2012 ◽  
Vol 502 ◽  
pp. 397-401
Author(s):  
Wei Li ◽  
Ning Liu ◽  
Ning Li ◽  
Guo Liang Liu
Keyword(s):  
Experimental Data ◽  
Fatigue Strength ◽  
High Frequency ◽  
Strength Test ◽  
Test Method ◽  
Short Life ◽  
Stress Group ◽  
Long Life ◽  
Limit Stress ◽  
Four Levels

This paper discussed on the research of fatigue strength test of 20CrMnMo carburized and quenched gears. This test is done through a fatigue machine of high-frequency electromagnetic resonant with pulse double-tooth loading. In the short-life area, give four levels of constant stress group test; in the long-life area, adopt up-down test method. According to the experimental data obtained in the tests and statistical theory, complete the C-R-S-N curve, and assess the values of limit stress under different reliabilities.

scholarly journals Fatigue Strength Analysis of S34MnV Steel by Accelerated Staircase Test

2020 ◽  
Vol 10 (1) ◽  
pp. 394-400 ◽  
Author(s):  
I. M. W. Ekaputra ◽  
Rando Tungga Dewa ◽  
Gunawan Dwi Haryadi ◽  
Seon Jin Kim
Keyword(s):  
Standard Deviation ◽  
Fatigue Strength ◽  
Fatigue Limit ◽  
Fatigue Testing ◽  
Reliability Estimation ◽  
Test Method ◽  
Strength Analysis ◽  
Staircase Method ◽  
Staircase Test ◽  
Number Of Cycles

AbstractThis paper presents the reliability estimation of fatigue strength of the material used for crank throw components. The material used for crank throw components is forged S34MnV steel and subsequently heat-treated by normalising and tempering. High cycle fatigue testing under fully reversed cycling (R = −1) was performed to determine the fatigue limit of the material. The staircase test method is used to obtain accurate values of the mean fatigue limit stress until a number of cycles up to 1E7 cycles. Subsequently, the fatigue test results depend strongly on the stress step and are evaluated by the Dixon-Mood formula. The values of mean fatigue strength and standard deviation predicted by the staircase method are 282 MPa and 10.6MPa, respectively. Finally, the reliability of the design fatigue strength in some selected probability of failure is calculated. Results indicate that the fatigue strength determined from accelerated staircase test is consistent with conventional fatigue testing. Furthermore, the proposed method can be applied for the determination of fatigue strength and standard deviation for design optimisation of S34MnV steel.

scholarly journals Tension Test Method and Thermal Degrandation of Fatigue Strength for Unidirectional CFRP Ring

2004 ◽  
Vol 53 (7) ◽  
pp. 806-811
Author(s):  
Tomohiro NARUSE ◽  
Toshio HATTORI ◽  
Haruo MIURA ◽  
Kazuki TAKAHASHI
Keyword(s):  
Fatigue Strength ◽  
Tension Test ◽  
Test Method

Research on Real-Time Measuring Method of Dynamic Deformation Based on Machine Vision and its Application

2011 ◽  
Vol 130-134 ◽  
pp. 3572-3576
Author(s):  
Li Zong Lin ◽  
Xiao Peng Ni ◽  
Luo Shan Zhou ◽  
Zhi Qin Qian
Keyword(s):  
Fatigue Strength ◽  
Machine Vision ◽  
Real Time ◽  
Dynamic Deformation ◽  
Measurement Data ◽  
Measuring Method ◽  
Strength Test ◽  
Time Deformation ◽  
Vision Measurement ◽  
Searching Method

Dynamic deformation measurement of machine parts in fatigue strength test is studied by using machine vision technique. Considering the uncertainty of parts surface, we adopt circular mark to locate the object profile in order to obtain high quality images. Through some image pre-processing with linear filtering, continuous contour searching method and circular detection based on random Hough transform (RHT), the real-time deformation can be measured with image characteristic parameters. In the practical application, the deformation of the loaded bicycle handle-bar is calculated. The test results show that the machine vision measurement is very effective; measurement resolution attains 0.1mm/pixel; the discrete degree of measurement data is low and the system meets the requirement of real-time measurement. The study proves that the measurement method of dynamic deformation based on machine vision is feasible, which can give some help for fatigue strength test of machine part and other structure deformation.

scholarly journals An Innovative Test Method for Tensile Strength of Concrete by Applying the Strut-and-Tie Methodology

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2776 ◽  
Author(s):  
Wen-Cheng Liao ◽  
Po-Shao Chen ◽  
Chung-Wen Hung ◽  
Suyash Kishor Wagh
Keyword(s):  
Tensile Strength ◽  
Test Methods ◽  
Standard Test ◽  
Strength Test ◽  
Tension Test ◽  
Test Method ◽  
Direct Tension ◽  
Direct Tension Test ◽  
Strut And Tie ◽  
Tensile Strength Test

Tensile strength is one of the important mechanical properties of concrete, but it is difficult to measure accurately due to the brittle nature of concrete in tension. The three widely used test methods for measuring the tensile strength of concrete each have their shortcomings: the direct tension test equipment is not easy to set up, particularly for alignment, and there are no standard test specifications; the tensile strengths obtained from the test method of splitting tensile strength (American Society for Testing and Materials, ASTM C496) and that of flexural strength of concrete (ASTM C78) are significantly different from the actual tensile strength owing to mechanisms of methodologies and test setup. The objective of this research is to develop a new concrete tensile strength test method that is easy to conduct and the result is close to the direct tension strength. By applying the strut-and-tie concept and modifying the experimental design of the ASTM C78, a new concrete tensile strength test method is proposed. The test results show that the concrete tensile strength obtained by this proposed method is close to the value obtained from the direct tension test for concrete with compressive strengths from 25 to 55 MPa. It shows that this innovative test method, which is precise and easy to conduct, can be an effective alternative for tensile strength of concrete.

Bonding strength test method assessment for Cross-Laminated Timber Derived Stressed-Skin Panels (CLT SSP)

2017 ◽  
Vol 50 (4) ◽  
Author(s):  
Emilio Luengo ◽  
Eva Hermoso ◽  
Juan Carlos Cabrero ◽  
Francisco Arriaga
Keyword(s):  
Bonding Strength ◽  
Strength Test ◽  
Test Method ◽  
Cross Laminated Timber ◽  
Skin Panels
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