DEVELOPMENT OF AN AXIAL - TORSION BIAXIAL FATIGUE TESTING MACHINE

2015 ◽  
Author(s):  
Eleazar Cristian Mejia Sanchez ◽  
Marco Antonio Meggiolaro ◽  
Jaime Tupiassú Pinho de Castro
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Axial Torsion ◽  
Biaxial Fatigue

scholarly journals Optimization Design of a Small-Sized Cruciform Specimen for Biaxial Fatigue Testing

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1148
Author(s):  
Zheng Lu ◽  
Jia-Yu Zhao ◽  
Chang-Yu Zhou ◽  
Xiao-Hua He
Keyword(s):  
Fatigue Test ◽  
Optimization Design ◽  
Fatigue Testing ◽  
Orthogonal Experiment ◽  
Testing Machine ◽  
Complex Stress State ◽  
Image Correlation ◽  
Minimum Thickness ◽  
Cruciform Specimen ◽  
Biaxial Fatigue

The in-plane biaxial specimen can well reflect the complex stress state of sheet metal. However, there is no standard for small-sized specimens used in the low-power biaxial fatigue testing machine. The main goal of this paper is to apply the finite element method and orthogonal experiment method to design the cruciform specimen, considering the influence of three main parameters including the diameter of the central semispherical thinning area, the minimum thickness of the center and the arm thickness of the specimen. According to the central strain dispersion coefficient and the strain concentration coefficient proposed in this paper, we ensured that the distribution of strain in the gauge area is uniform and the strain it at its maximum value at the same time. The optimized specimen is verified by a biaxial fatigue test with the digital image correlation (DIC) technique. It is found that the fatigue crack appears in the center region, which proves that the optimized specimen can be effectively used for biaxial fatigue test.

Biaxial Tension-Tension Fatigue Strengths of Metals

1949 ◽  
Vol 16 (4) ◽  
pp. 383-388
Author(s):  
Joseph Marin
Keyword(s):  
Fatigue Strength ◽  
Axial Load ◽  
Fatigue Testing ◽  
Biaxial Tension ◽  
Testing Machine ◽  
Tubular Specimen ◽  
Principal Stresses ◽  
Biaxial Fatigue ◽  
Thin Walled ◽  
Stress Ratios

Abstract This paper describes a new fatigue testing machine for the application of tension-tension biaxial stresses and presents the results of an investigation on the biaxial fatigue strength of Alcoa 24S-T. The influence of various ratios of the maximum values of the principal stresses upon the fatigue strength was determined. Fluctuating biaxial tensile stresses were produced by subjecting a thin-walled tubular specimen to a pulsating internal pressure and a pulsating axial load. The maximum and minimum values of the principal stresses were kept in phase. Fatigue strengths and S-N diagrams for four principal stress ratios were obtained.

On a New Rotating Bending Fatigue Testing Machine

1966 ◽  
Vol 15 (148) ◽  
pp. 49-54
Author(s):  
Minoru KAWAMOTO ◽  
Katsumi SUMIHIRO ◽  
Koji KIDA
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

Prototype of Compact Flexural Fatigue Testing Machine

2014 ◽  
Vol 554 ◽  
pp. 350-354
Author(s):  
Muhammad Azrie Husainy Mohd Jasri ◽  
Mohd Afendi ◽  
A.H.M. Fauzi
Keyword(s):  
Fatigue Failure ◽  
Electromagnetic Force ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Working Environment ◽  
Motion Sensor ◽  
Flexural Fatigue ◽  
The Real ◽  
The Cost ◽  
Dynamic Fatigue

The purpose of this project is to build a prototype of compact flexural fatigue testing machine and to strive for an easy working-environment as required by the users besides cutting the cost of the machining. This particular project is about to build the prototype of compact flexural fatigue testing machine in compact mode. In this project, the prototype will be functioning 60% similar to the real fatigue machine which is Dynamic Fatigue Testing Machine (INSTRON) due to timer counter, frequency and load applied. But the new invention is this prototype was using the concept of electromagnetic force relay that will apply to the specimen using the application of basic electronics. The motion sensor also being applied to this prototype to achieve accurate results when the specimen breaks up after undergoes a fatigue failure.

Surface Durability of Spur Gears at Hertzian Stresses Over Shakedown Limit

1974 ◽  
Vol 96 (2) ◽  
pp. 359-372 ◽  
Author(s):  
Akira Ishibashi ◽  
Taku Ueno ◽  
Shigetada Tanaka
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Carbon Steels ◽  
Rolling Contact ◽  
Hertzian Contact ◽  
Load Testing ◽  
Short Period ◽  
Hertzian Contact Stress ◽  
Surface Durability ◽  
Shakedown Limit

Using a new type of gear-load testing machine and a disk-type rolling fatigue testing machine designed and made by the authors, the upper limits of Hertzian contact stress allowable on rolling contact surfaces were investigated. It was shown conclusively that gears and rollers made of soft carbon steels could be rotated beyond 108 revolutions at Hertzian stresses over shakedown limit (≈ 0.4 HB). In the case of gears, pits having a pitting area ratio of 0.04 percent occurred during 1.16 × 108 rotations at a Hertzian stress of 0.50 HB. However, no pitting occurred on the roller rotated through 1.20 × 108 revolutions at a Hertzian stress of 0.71 HB, although appreciable changes in texture were observed at the subsurface. In order to rotate gears or rollers at Hertzian stresses over shakedown limit, their surface must either be very smooth initially or after a short period of running, and an oil film must be formed between contacting surfaces.

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