Crack growth of explosive welding zirconium-steel bimetal subjected to cyclic bending

2017 ◽  
Author(s):  
D. Rozumek ◽  
Z. Marciniak
Keyword(s):  
Fatigue Life ◽  
Crack Growth ◽  
Fatigue Test ◽  
Cross Section ◽  
Explosive Welding ◽  
Test Results ◽  
Cyclic Bending ◽  
Interaction Mechanisms ◽  
Melted Layer

The paper presents the fatigue test results including the cracks growth in the composite zirconium-steel subjected to oscillatory bending. Specimens of square cross-section without melted layer and with a melted layer were tested. In the specimens the net ratio of thickness of steel to zirconium layers was h1 : h2 = 2.5 : 1. It was observed that a higher fraction of the intermetallic inclusions near the interface increase the fatigue life. Two different interaction mechanisms between a crack and interface were observed.

A Fatigue Test Method for Tire Specimens

2010 ◽  
Author(s):  
Dong-Wook Cha ◽  
Hyun-Yong Jeong
Keyword(s):  
Fatigue Life ◽  
Crack Growth ◽  
Fatigue Test ◽  
Aging Temperature ◽  
Test Method ◽  
Shear Stresses ◽  
Test Results ◽  
Mode Iii ◽  
Interlaminar Shear

Crack growth in tires plays an important role in the durability of tires, and it is necessary to evaluate the characteristics of crack growth accurately. Since a tire is subjected to interlaminar shear stresses, a Mode III fatigue test method was developed. The fatigue life of three different tire specimens was measured by using the fatigue test method. Based on the fatigue test results, the effects of heat aging, temperature and belt stiffness on crack growth were analyzed.

scholarly journals Analysis of the Correlation between the Static and Fatigue Test Results of the Interlayer Bondings of Asphalt Layers

2016 ◽  
Vol 62 (1) ◽  
pp. 83-98 ◽  
Author(s):  
A. Szydło ◽  
K. Malicki
Keyword(s):  
Fatigue Life ◽  
Fatigue Test ◽  
Asphalt Mixture ◽  
Fatigue Tests ◽  
Test Results ◽  
Static Tests ◽  
Bonding State ◽  
Road Pavement ◽  
The Future ◽  
Pavement Structure

Abstract The bonding state of the asphalt layers in a road pavement structure significantly affects its fatigue life. These bondings, therefore, require detailed tests and optimization. In this paper, the analyses of the correlation between the results of laboratory static tests and the results of fatigue tests of asphalt mixture interlayer bondings were performed. The existence of the relationships between selected parameters was confirmed. In the future, the results of these analyses may allow for assessment of interlayer bondings’ fatigue life based on the results of quick and relatively easy static tests.

scholarly journals Study of Fatigue and Bending Properties For Epoxy / Kevlar - Glass Fibers and Hybrid Composite

2014 ◽  
Vol 11 (2) ◽  
pp. 540-546
Author(s):  
Baghdad Science Journal
Keyword(s):  
Fatigue Life ◽  
Glass Fiber ◽  
Fatigue Test ◽  
Hybrid Composite ◽  
Glass Fibers ◽  
Fatigue Property ◽  
Test Results ◽  
Kevlar Fiber ◽  
Prepared Material ◽  
Better Than

In this research a study of the effect of quality, sequential and directional layers for three types of fibers are:(Kevlar fibers-49 woven roving and E- glass fiber woven roving and random) on the fatigue property using epoxy as matrix. The test specimens were prepared by hand lay-up method the epoxy resin used as a matrix type (Quick mast 105) in prepared material composit . Sinusoidal wave which is formed of variable stress amplitudes at 15 Hz cycles was employed in the fatigue test ( 10 mm )and (15mm) value 0f deflection arrival to numbers of cycle failure limit, by rotary bending method by ( S-N) curves this curves has been determined ( life , limit and fatigue strength) of composite . The results show us the reinforcement has important act to increased resistance to the fatigue compared with specimens have non reinforcement this side the specimens reinforcement of glass fiber have resistance to fatigue and fatigue life better than the specimens reinforcement of Kevlar fiber . According to hybrid composite sample fatigue test results showed that the sample which reinforced (Kevlar - regular glass – Kevlar) has a best results which showed stress carrying the most powerful and longer fatigue life with more than (1.3 ×10 6) cycle from other hybrids , while the sample with the sample with three Kevlar reinforced layers have less resistant to fatigue

A Standardised Method of Representing Fatigue Test Results

1958 ◽  
Vol 62 (570) ◽  
pp. 456-457 ◽  
Author(s):  
M. Fine
Keyword(s):  
Fatigue Life ◽  
Fatigue Test ◽  
Test Results ◽  
Flat Part

Figure 1 is a set of S-N curves for DTD. 150, taken from Rotol Structures Department Report No. 337. It is difficult to estimate N accurately on the flat part of the curve, and estimates of fatigue life by different people can be very different. Fig. 1, although based on scanty test results, is typical of S-N curves.

A Study on Improvement of Fatigue Life for Woven Glass Fabric/Epoxy Laminate Composite Applied to Railway Vehicle

2010 ◽  
Vol 654-656 ◽  
pp. 2583-2586
Author(s):  
Hee Young Ko ◽  
Kwang Bok Shin ◽  
Jung Seok Kim
Keyword(s):  
Fatigue Life ◽  
Fatigue Test ◽  
Stress Ratio ◽  
Laminate Composite ◽  
Glass Fabric ◽  
Railway Vehicle ◽  
Test Results ◽  
Laminate Composites ◽  
Remarkable Improvement ◽  
Fatigue Characteristics

In this study, the fatigue characteristics and life of woven glass fabric/epoxy laminate composites applied to railway vehicle were evaluated. The fatigue test was conducted by tension-tension load with stress ratio R of 0.1 and frequency of 5Hz. The material used to fatigue test was two types of woven glass fabric/epoxy laminate composite with and without the reinforcement of carbon/epoxy ply. Also, the fatigue life of woven glass fabric/epoxy laminate composite was compared with that of aluminum 6005 used to the car-body and under-frame structures of railway vehicle. The test results showed that the failure strength and life of woven glass fabric/epoxy laminate composite with the reinforcement of three carbon/epoxy plies had a remarkable improvement in comparison with that of bare specimen without reinforcement.

Experimental Study on Fatigue Life of Steel Beams Strengthened with a CFRP Plate

2008 ◽  
Vol 33-37 ◽  
pp. 163-168 ◽  
Author(s):  
Jun Deng ◽  
Marcus M.K. Lee ◽  
Pei Yan Huang
Keyword(s):  
Fatigue Life ◽  
Crack Initiation ◽  
Crack Propagation ◽  
Fatigue Test ◽  
Interfacial Stress ◽  
Steel Beams ◽  
Test Results ◽  
Load Range ◽  
Cfrp Plate ◽  
Crack Initiation Life

The adhesive bonding between the steel beam and carbon fibre reinforced polymer (CFRP) plate is the weakest link and fatigue performance is a major consideration. This paper gives details of a fatigue test programme of a series of small-scale steel beams bonded with a CFRP plate. Two phases of the fatigue life, including crack initiation life and crack propagation life, are considered. Backface-strain technique was applied to monitor crack initiation. An S-N curve was developed from the test results. The curve correlates the maximum principal interfacial stress at the plate end to the crack initiation life. The fatigue limit of the S-N curve was found to be about 30% of the ultimate static failure stress. In accordance with Paris Law, moreover, an equation was developed to predict the number of cycles during the crack propagation. The empirical coefficients of the equation were obtained from the fatigue test results. This equation can correctly predict the crack propagation life. The fatigue load range affects the fatigue life, but its significance is much less than the magnitude of the maximum load in the load range.

Influence of crack growth behavior in silica glass on fatigue test results

2002 ◽  
Author(s):  
Sergey L. Semjonov ◽  
G. Scott Glaesemann ◽  
Mikhail M. Bubnov
Keyword(s):  
Crack Growth ◽  
Fatigue Test ◽  
Silica Glass ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Test Results

Fatigue Properties Assessment of Corroded Cable

2009 ◽  
Vol 413-414 ◽  
pp. 757-764 ◽  
Author(s):  
Cheng Ming Lan ◽  
Hui Li
Keyword(s):  
Monte Carlo ◽  
Fatigue Life ◽  
Fatigue Test ◽  
Fatigue Properties ◽  
Test Results ◽  
Original Design ◽  
Parallel Wire ◽  
Parallel Wire Cable ◽  
As Stress ◽  
Wire Fatigue

Based on fatigue test results of corroded wires obtained from dissection of actual parallel wire cables which were used on a certain domestic cable-stayed bridge, the fatigue properties of corroded parallel wire cable are investigated by the method of Monte Carlo simulation in this paper. The results of fatigue life and corrosion degree of corroded wire are presented. Comparisons between the original design information and fatigue test results, it can be seen that corrosions make the fatigue lives of wires decreasing sharply. The fatigue life of individual wire is described by Weibull distribution considered some useful parameters such as, stress range, mean stress, mean static strength and length effects. The effects of percentage of broken wire, cable S-N curve parameter on cable fatigue life are discussed. It can be seen that the cable fatigue lives are controlled by a small fraction of the cable wires with the shortest fatigue lives. Finally, the S-N curves of cable are calculated by Monte Carlo simulations based on the results of individual wire fatigue test, and compared with the results of cable fatigue test.

Influence of the Microstructure near the Interface on the Fatigue Life of Explosively Welded (Carbon Steel)/Zr Clads

2013 ◽  
Vol 592-593 ◽  
pp. 704-707 ◽  
Author(s):  
M. Prażmowski ◽  
Henryk Paul ◽  
Dariusz Rozumek ◽  
Ewa Marcisz
Keyword(s):  
Fatigue Life ◽  
Carbon Steel ◽  
Explosive Welding ◽  
Fatigue Cracks ◽  
Test Results ◽  
Joint Zone ◽  
Welding Technology ◽  
Zone Microstructure

The paper presents joint zone microstructure and the test results obtained for fatigue cracks in zirconium-steel bimetal under bending. The materials were joined with explosive welding technology, and special attention was paid to characteristics of the joint zone.

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