The Effect of Periodic Overloads on Biaxial Fatigue of Normalized SAE 1045 Steel PDF Download
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Author: TH. Topper
Publisher:
ISBN:
Category : Axial loads
Languages : en
Pages : 19
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Book Description
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: TH. Topper
Publisher:
ISBN:
Category : Axial loads
Languages : en
Pages : 19
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Book Description
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: Sreeramesh Kalluri
Publisher: ASTM International
ISBN: 9780803128651
Category : Science
Languages : en
Pages : 466
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Book Description
Contains papers from a May 1999 symposium, describing state-of-the-art multiaxial testing techniques and analytical methods for characterizing fatigue and deformation behaviors of engineering materials. Papers are classified into sections on multiaxial strength of materials, multiaxial deformation,
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Carlos Guedes Soares
Publisher: CRC Press
ISBN: 1315731592
Category : Technology & Engineering
Languages : en
Pages : 1450
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Book Description
Maritime Technology and Engineering includes the papers presented at the 2nd International Conference on Maritime Technology and Engineering (MARTECH 2014, Lisbon, Portugal, 15-17 October 2014). The contributions reflect the internationalization of the maritime sector, and cover a wide range of topics: Ports; Maritime transportation; Inland navigat
Author:
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 796
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Book Description
Author: Colin MacDougall
Publisher:
ISBN:
Category :
Languages : en
Pages : 256
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 856
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Author: DL. DuQuesnay
Publisher:
ISBN:
Category : Compression
Languages : en
Pages : 11
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Book Description
Smooth cylindrical specimens of 2024-T351 aluminum alloy and SAE 1045 steel were tested under constant amplitude cycling to study the effect of compressive stress on fatigue life. The results show a reduction in the fatigue life at constant maximum stress as the compressive portion of the stress cycle is increased.
Author: Justin Lindsey
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 127
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Book Description
Variable amplitude loading of components or structures can result in failures which occur much sooner than would be predicted by commonly used life prediction models, utilizing constant amplitude loading. The goal of this study was to investigate the effect of periodic overloads on fatigue behavior of smooth specimens made from five grades of steel and one grade of aluminum. This history included a periodic fully-reversed overload cycle followed by smaller cycles in the presence of a mean stress. Life predictions were performed for each test by implementing the Linear Damage Rule along with the strain-life equation or Smith-Watson-Topper (SWT) mean stress parameter. Life predictions were then compared to experimental results. Life predictions with the SWT parameter showed an increase in accuracy versus the strain-life method but there still remained predictions that were unaffected by the use of this parameter. Presence of periodic overloads in a load history resulted in increased damage for small cycles not only at strain levels above the fatigue limit, but also in damage for cycles below the fatigue limit. Additional tests were performed in order to identify the amount of damage resulting from individual aspects of the load history. These aspects included small cycles in the presence of mean stress without overloads, fully-reversed small cycles with overloads, as well as variations in the number of small cycles per load block. Comparison of these different aspects showed that in some cases the application of mean stress in the periodic overload history resulted in little to no additional small cycle damage. Anisotropy resulting from sulfide inclusions was examined by applying the periodic overload history to three sets of steel 4140 containing three different levels of sulfur content (0.004%, 0.012%, and 0.077%). The specimens were machined so that the axis of the specimen was transverse to the rolling direction of the material. Results of the testing showed that, although the sulfur content has a drastic effect on fully-reversed constant amplitude fatigue lives, there is little noticeable different between the materials with different levels of sulfur in the presence of periodic overloads.
Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 2566
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Book Description
