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Contact stresses

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Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630189
EISBN: 978-1-62708-270-9
...Characteristics of contact stress fatigue Table 2 Characteristics of contact stress fatigue Characteristic Surface pitting Subsurface pitting Subcase fatigue Location of origin Surface, often at “micropits” Short distance below surface, usually at a nonmetallic inclusion Near...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250293
EISBN: 978-1-62708-345-4
... and breakage of gear tooth, life determined by contact stress and bending stress, analysis of gear tooth failure by breakage after pitting, and metallurgical flaws that reduce the life of gears. The chapter briefly reviews some components in the design and structure of each gear and/or gear train that must...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610461
EISBN: 978-1-62708-303-4
... (a) Up, toward top; down, toward root. (b) Negative sliding: rolling and sliding are in opposite directions. (c) Positive sliding: rolling and sliding are in the same direction. Source: Ref 7 Characteristics of contact-stress fatigue Table 2 Characteristics of contact-stress fatigue...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250227
EISBN: 978-1-62708-345-4
.... Nitriding produces a wear- and fatigue-resistant surface on gear teeth and is used in applications where gears are not subjected to high shock loads or contact stress. It is useful for gears that need to maintain their surface hardness at elevated temperatures. Gears used in industrial, automotive...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250311
EISBN: 978-1-62708-345-4
..., namely dimensional, surface finish texture, metallurgical, and residual stress. The following section presents the tests that simulate gear action, namely the rolling contact fatigue test, the single-tooth fatigue test, the single-tooth single-overload test, and the single-tooth impact test. Finally...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410499
EISBN: 978-1-62708-265-5
..., carbonitriding, and nitrocarburizing. The discussion on carburizing addresses several interrelated factors, including processing principles, alloying, surface oxidation, residual stresses, bending fatigue, contact fatigue, and fracture. carbonitriding carburizing ferritic nitrocarburizing flame...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770135
EISBN: 978-1-62708-337-9
... in zone II. P 0 , maximum pressure at the surface; b, half the contact width. Source: Ref 53 Fig. 6.40 (a) Curves showing the distribution of the τ 45 and τ ortho stresses during one cycle of pure rolling contact. Note that τ 45 stress has the highest magnitude, but τ ortho has...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860515
EISBN: 978-1-62708-348-5
... and auxiliary materials. Areas of frequent concern, such as thermal contact, heat leak, thermal anchoring, thermal conductivity of greases, insulators, lead wires, ground loops, and feedthroughs are also reviewed. The chapter provides an overview and historical development of temperature scales because...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270070
EISBN: 978-1-62708-301-0
... bolts used in a radar antenna system reflector joint fractured at the fillet of the head. The fracture was intergranular. The bolts had improper seating, making contact only at the periphery. This resulted in high stress concentration at the fillet and subsequent cracking, aggravated by the presence...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110652
EISBN: 978-1-62708-247-1
... stress. Figure 8 MM. Severe damage at the contacts of the ESD protection structure. Figure 9 Is a close up magnified view of a typical pitted contact where the hole is very deep compared to the relatively shallow holes found for HBM. Figure 17 Degraded I-V curves showing...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870237
EISBN: 978-1-62708-344-7
... effects, foreign particles, and stresses generated by rolling contact. crack growth crack initiation dislocations fatigue mechanism plasticity rolling contact Introduction There has always been an aura of mystery regarding why metals, and materials in general, fail in fatigue...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.htpa.t53310167
EISBN: 978-1-62708-346-1
... in the future (estimation of the measurement uncertainty and procedures for the determination of true stress-strain curves). Contact Mechanics Phenomenological Theory The information given in this chapter is based, among other things, on the surveys of Fischer-Cripps ( Ref 9 ) and Chudoba ( Ref 10...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770001
EISBN: 978-1-62708-337-9
... stress. For example, in Fig. 2 , the surface-hardened test gears failed due to tooth pitting at contact stresses of 1400 to 1500 MPa. These tests represent nitrided marine and industrial gears that have, in this instance, a design limit of about 1000 MPa ( Ref 3 ). Comparable gear tests have been...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250257
EISBN: 978-1-62708-345-4
... of gear failure analysis. contact fatigue failure analysis fatigue failure gears macropitting micropitting rolling-contact fatigue scuffing spalling stress rupture subcase fatigue thermal fatigue wear GEARS can fail in many different ways, and except for an increase in noise level...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320033
EISBN: 978-1-62708-347-8
... of hardness versus case depth in gears made of HP 9-4-30 steel Now the question is, how much case is needed on a gear tooth to prevent case failure due to Hertzian contact stress that causes pitting? In general, high case depths adversely affect the quality of case and, hence, the gear life. So...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040295
EISBN: 978-1-62708-300-3
... ]. Complex precision-forged parts are almost exclusively produced in closed dies. Therefore, the dies have to withstand high contact pressures well above the flow stress of the billet material at the forging temperature. Also, the amount of surface generation and the sliding velocities at which the billet...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320133
EISBN: 978-1-62708-347-8
... or contact stress above 1340 MPa (195 ksi) for AGMA grade 3, and 1190 MPa (172 ksi) for grade 2 materials. It is particularly useful for gears that need to maintain their surface hardness at elevated temperature. Nitriding of gears can be done in either a gas or liquid medium containing nitrogen. Industrial...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770199
EISBN: 978-1-62708-337-9
... 4028 Shot peened 62.2 36 1.1 0.044 2265 329 1035 150 (a) Converted from HRA. (b) Distance to 510 HV Fig. 8.25 Relationship between fatigue limit at 10 7 cycles and contact stress for case-hardened 20Kh2N4A test pieces (7.5 mm diam, 1.1 to 1.5 mm case depth). Source: Ref...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250163
EISBN: 978-1-62708-345-4
... is needed on a gear tooth to prevent case failure due to Hertzian contact stress that causes pitting? In general, high case depths adversely affect the quality of case and, hence, the gear life. So, the determination of proper case depth on a gear tooth is quite important and is based on its capacity...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250019
EISBN: 978-1-62708-345-4
... because they are subjected to high Hertzian contact stresses and many stress cycles. For example, through-hardened gears are typically designed to withstand contact stresses of approximately 700 MPa (100 ksi), while the contact stresses on carburized gears may reach 2100 MPa (300 ksi). In addition...