Comparison of fatigue properties using 2-point and 4-point bending tests – Czech experience

2012 ◽  
pp. 205-212 ◽  
Author(s):  
P Hyzl ◽  
M Varaus ◽  
P Mondschein ◽  
J Valentin ◽  
V Sou_ek
Keyword(s):  
Fatigue Properties ◽  
Bending Tests

The Influence of the Ferrite and Pearlite Grain Size on the S-N Fatigue Characteristics of Steel

2014 ◽  
Vol 224 ◽  
pp. 3-8 ◽  
Author(s):  
Sebastian Kamiński ◽  
Marcel Szymaniec ◽  
Tadeusz Łagoda
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Volume Fraction ◽  
Fatigue Properties ◽  
Phase Volume ◽  
Bending Tests ◽  
Phase Volume Fraction ◽  
Similar Chemical ◽  
Fatigue Characteristics ◽  
Ferrite Grain Size

In this work an investigation of internal structure influence on mechanical and fatigue properties of ferritic-pearlitic steels is shown. Ferrite grain size and phase volume fraction of three grades of structural steel with similar chemical composition, but different mechanical properties, were examined. Afterwards, samples of the materials were subjected to cyclic bending tests. The results and conclusions are presented in this paper

scholarly journals Using Fatigue Characteristics to Analyse Test Results for 16Mo3 Steel under Tension-Compression and Oscillatory Bending Conditions

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1197 ◽  
Author(s):  
Andrzej Kurek
Keyword(s):  
Compression Test ◽  
Experimental Tests ◽  
Fatigue Tests ◽  
Test Method ◽  
Fatigue Properties ◽  
Test Results ◽  
Bending Tests ◽  
Fatigue Characteristics ◽  
Cost Efficient ◽  
Plastic Components

In this study, 16Mo3 steel was analysed for fatigue tests under tension-compression and oscillatory bending conditions. The analysis involved a comparison of fatigue test results obtained using the Manson-Coffin-Basquin, Langer and Kandil models and the models proposed by Kurek-Łagoda. It was observed that it is possible to substitute the basic tension-compression test performed in large testing machines with oscillatory bending tests carried out on a simple, modern test stand. The tests were performed under oscillatory bending on a prototype machine. The testing of 16Mo3 steel proved that the best-known Mason-Coffin-Basquin fatigue characteristic describes the results of all of the experimental tests very well, but the model can only be used when it is possible to divide strains into elastic and plastic components. It should be emphasised here that there is no such possibility in the case of tests performed under oscillatory bending conditions. It was proven that the proposed test method can substitute the tension-compression test very well and be a much more cost efficient way to obtain LCF material fatigue properties.

Test and Analysis on Asphalt Content for Fatigue Performance of Polyester Fiber Asphalt Concrete

2016 ◽  
Vol 852 ◽  
pp. 1488-1492 ◽  
Author(s):  
Jin Rong Wu ◽  
Qin Yong Ma ◽  
Xiao Hong Dong
Keyword(s):  
Asphalt Concrete ◽  
Structural Design ◽  
Asphalt Pavement ◽  
Polyester Fiber ◽  
Fatigue Performance ◽  
Fatigue Properties ◽  
Bending Tests ◽  
Three Point Bending ◽  
Asphalt Content ◽  
Improve Fatigue

The change law for fatigue properties of polyester fiber asphalt concrete was acquired under different asphalt content by three point bending tests. The results indicate that fatigue life of polyester fiber asphalt concrete increases firstly and then declines with asphalt content increasing, which shows an optimum asphalt content,4.8%. The optimal asphalt content of polyester fiber asphalt concrete is bigger than that of common asphalt concrete. The way to improve fatigue performance of asphalt pavement is found through studying on polyester fiber asphalt concrete. All will provide a theoretical basis for structural design of asphalt pavement.

Bone plate-screw constructs for osteosynthesis – recommendations for standardized mechanical torsion and bending tests

2018 ◽  
Vol 63 (6) ◽  
pp. 719-727
Author(s):  
Hendrik Schorler ◽  
Robert Wendlandt ◽  
Christian Jürgens ◽  
Arndt-Peter Schulz ◽  
Christian Kaddick ◽  
...  
Keyword(s):  
Dynamic Testing ◽  
Biomechanical Testing ◽  
Failure Criteria ◽  
Test Methods ◽  
Bone Plate ◽  
Fatigue Properties ◽  
Specific Test ◽  
Bending Tests ◽  
Physiological Loading ◽  
Conventional Systems

Abstract This paper follows up on a recent systematic review of test methods and parameters for biomechanical testing of bone plates and it is the first study that contains recommendations for standardized mechanical testing of bone plate-screw constructs for osteosynthesis. Following the testing philosophy of ASTM F382 and ISO 9585, we have developed standardized quasi-static and dynamic testing methods for straight linear and anatomically shaped plates, including locked type and conventional systems. The test specification comprises torsion and bending tests along the implant axis and therefore modifies and extends the methods proposed by ASTM F382. We present specific test setups in order to determine product-specific characteristics of the mechanical construct, consisting of the bone plate with corresponding screws (such as construct stiffness, yield strength, ultimate strength and fatigue properties) under the condition that it is rigidly fixed to “healthy bone”. We also address specific testing requirements that are important for the purpose of standardization, such as the positioning of the construct for testing or the number of screws in the diaphysis and metaphysis. Finally, we define the outcome parameters and associated failure criteria related to quasi-static and dynamic testing for comparative purposes. This paper does not intend to replace biomechanical testing of those devices under physiological loading conditions.

High Cycle Fatigue Properties of Aluminium Foams

1998 ◽  
Vol 521 ◽  
Author(s):  
B. E. Zettl ◽  
S. E. Stanzl-Tschegg ◽  
R. Gradinger ◽  
H. P. Degischer
Keyword(s):  
Mechanical Properties ◽  
Fatigue Properties ◽  
Fatigue Lifetime ◽  
Lifetime Measurements ◽  
Bending Tests ◽  
Testing Method ◽  
Quantitative Image ◽  
Static Mechanical ◽  
Cast Alloys ◽  
Static Mechanical Properties

ABSTRACTFatigue lifetime measurements have been performed on foamed Al-Mg-Si wrought alloys and Al-Si cast alloys in the high cycle range using an ultrasonic resonance testing method. The porous structure of the material is described by quantitative image analysis of optical micrographs and non destructively by X-ray computer tomography. The static mechanical properties as determined by tensile, compression and bending tests in earlier studies are used for material characterisation in this paper. The evaluation of the stress strain curves is specified for porous structures to obtain the stiffness and the plateau strength. The influence of the surface skin on the mechanical properties as well as on oscillation behaviour during lifetime measurements was studied.

scholarly journals Bending Properties of Additively Manufactured Commercially Pure Titanium (CPTi) Limited Contact Dynamic Compression Plate (LC-DCP) Constructs: Effect of Surface Treatment

2021 ◽  
Author(s):  
Seungjong Lee ◽  
Nabeel Ahmad ◽  
Kayla Corriveau ◽  
Cameron Himel ◽  
Daniel Silva ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Bending Strength ◽  
Dynamic Compression ◽  
Pure Titanium ◽  
Fatigue Properties ◽  
Single Shot ◽  
Structural Stiffness ◽  
Commercially Pure Titanium ◽  
Bending Tests ◽  
Bending Fatigue

Abstract BackgroundAdditive manufacturing of metallic materials, a layer-wise manufacturing method, is currently gaining attention in the biomedical industry because of its capability to fabricate complex geometries including customized parts fitting to patient requirements. However, one of the major challenges hindering the full implementation of additively manufactured parts in safety-critical applications is their poor mechanical performance under cyclic loading. This study investigated both quasi-static bending properties (bending stiffness, bending structural stiffness, and bending strength) and bending fatigue properties of additively manufactured (AM) commercially pure titanium (CPTi) limited contact dynamic compression plate (LC-DCP) constructs. The results were compared with commercially manufactured (CM) counterparts.MethodsAM CPTi LC-DCP with different surface conditions including as-built, single shot-peened, dual shot-peened, and chemically assisted surface enhancement conditions and CM counterparts were mechanically tested based on ASTM International standard for metallic bone plates (ASTM F382). Bending stiffness, bending structural stiffness, and bending strength was measured by quasi-static bending tests, and bending fatigue properties were obtained by cyclic bending tests. ResultsBending stiffness and bending structural stiffness of AM CPTi LC-DCPs are comparable to CM counterparts; however, the bending strength of AM CPTi LC-DCPs is lower than CM counterparts. The fatigue strength of as-built AM CPTi LC-DCPs is lower compared to the CM counterparts. However, after post surface treatments, single shot-peened, dual shot-peened, and chemically assisted surface enhancement AM CPTi LC-DCPs exhibit statistically comparable fatigue strength to the CM CPTi LC-DCPs.ConclusionAM CPTi LC-DCP could be considered as an alternative to CM LC-DCP in applications that require less bending strength (~5.44 N·m). Post surface treatment should be considered on as-built implants to improve fatigue strength.

Effect of Texture and {10-12} Twin on the Low Cycle Fatigue Properties of Rolled AZ31 Mg Alloy

2013 ◽  
Vol 51 (5) ◽  
pp. 325-332 ◽  
Author(s):  
Sung Hyuk Park ◽  
Seong-Gu Hong ◽  
Chong Soo Lee ◽  
Ha Sik Kim
Keyword(s):  
Low Cycle Fatigue ◽  
Mg Alloy ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Az31 Mg Alloy

Full-Scale Torsion, Shear, and Bending Tests of Prestressed I-Girders

PCI Journal ◽  
1978 ◽  
Vol 23 (2) ◽  
pp. 22-41 ◽  
Author(s):  
Alan H. Mattock ◽  
A. N. Wyss
Keyword(s):  
Full Scale ◽  
Bending Tests
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