The Influence of High R Ratio on Sharpley Notched Fatigue Behavior of 1045 Steel with Three Different Heat Treatments PDF Download
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Author: Trent J. Pals
Publisher:
ISBN:
Category :
Languages : en
Pages : 212
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Author: Trent J. Pals
Publisher:
ISBN:
Category :
Languages : en
Pages : 212
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Author: Thomas Robert Vantiger
Publisher:
ISBN:
Category :
Languages : en
Pages : 176
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Author: Murat Karadag
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
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Author: Tim Wehner
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 136
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Author: TH. Topper
Publisher:
ISBN:
Category : Axial loads
Languages : en
Pages : 19
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During the past decade it has been observed that periodically applied overloads of yield stress magnitude can significantly reduce or eliminate crack closure under uniaxial or Mode I loading. This paper reports the results of a series of biaxial in-phase tension-torsion experiments that were performed to evaluate the effects of overloads on the fatigue life of smooth tubes constructed of normalized SAE 1045 steel. Five strain ratios were investigated, including uniaxial (? = ?xy/?xx = 0), pure torsion (? = ?), and three intermediate ratios (? = 3/4, 3/2, and 3). Periodically applied overloads of yield stress magnitude allowed cracks to grow under crack face interference-free conditions. Strain-life curves were developed by computationally removing the overload cycle damage from test results and calculating equivalent fatigue lives. A factor of two reduction in the fatigue limit was found at all ratios when these results were compared with constant-amplitude results. Cracking behavior was observed and it was noted that for strain ratios greater than one, cracks initiated along the rolling direction (longitudinally); otherwise, the cracks initiated on maximum shear planes. This observation was used to help explain the similarity in fatigue life results for all strain ratios for both constant-amplitude and overload data. Parameter-life curves were developed using the equivalent fatigue life data and several common multiaxial damage parameters, and the damage parameters were evaluated. It was found that the simple maximum shear strain criterion together with uniaxial overload data provided a good estimate of the fatigue behavior for all strain ratios.
Author: Colin MacDougall
Publisher:
ISBN:
Category :
Languages : en
Pages : 256
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Author: Dente Duncan Poland
Publisher:
ISBN:
Category :
Languages : en
Pages : 174
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Author: R. Farrara
Publisher:
ISBN: 9780642120885
Category : Austenitic stainless steel
Languages : en
Pages : 26
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Book Description
Fatigue and fracture toughness properties were determined for STA60 precipitation hardening stainless steel used in the structure of the 105 mm Light Gun. Fatigue properties (S-N crack for initiation and crack growth rate) and fracture toughness were measured on both parent sheet and welded joints for a range of heat treatments including fully re-heat treated and peak aged (450 deg C), overaged as in production (530 deg C), and as-welded joints not re-heat treated. The material was found to be notch sensitive. Fatigue crack growth was much faster, and fracture toughness much lower, in the longitudinal (rolling) direction of sheet because of the presence of nonmetallic stringers in the microstructure. Overaging had little effect on fatigue properties compared with peak ageing, but did achieve a significant improvement in fracture toughness. Weld metal was more resistant to fatigue crack initiationn than parent sheet, but welds not re-heat treated were drastically limited in all three properties because the weld heat-affected zones remained in the soft condition.
Author: Joseph Edward Shigley
Publisher: McGraw-Hill Professional Publishing
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 1672
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Book Description
The latest ideas in machine analysis and design have led to a major revision of the field's leading handbook. New chapters cover ergonomics, safety, and computer-aided design, with revised information on numerical methods, belt devices, statistics, standards, and codes and regulations. Key features include: *new material on ergonomics, safety, and computer-aided design; *practical reference data that helps machines designers solve common problems--with a minimum of theory. *current CAS/CAM applications, other machine computational aids, and robotic applications in machine design. This definitive machine design handbook for product designers, project engineers, design engineers, and manufacturing engineers covers every aspect of machine construction and operations. Voluminous and heavily illustrated, it discusses standards, codes and regulations; wear; solid materials, seals; flywheels; power screws; threaded fasteners; springs; lubrication; gaskets; coupling; belt drive; gears; shafting; vibration and control; linkage; and corrosion.
Author: L. N. Dash
Publisher:
ISBN: 9788190655378
Category : India
Languages : en
Pages : 0
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