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Book Chapter

Failure Analysis of a Cam–Follower System Affected by a Crack

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By M. Tounsi, M.S. Abbes, T. Fakhfakh, M. Haddar
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001797
EISBN: 978-1-62708-241-9
... Abstract Cam crack failures are a common occurrence in cam-follower systems often caused by excessive loading or inappropriate operating conditions. An investigation into such a failure was conducted to assess the effect of cam crack damage on the dynamic behavior of cam-follower systems...
Abstract
Cam crack failures are a common occurrence in cam-follower systems often caused by excessive loading or inappropriate operating conditions. An investigation into such a failure was conducted to assess the effect of cam crack damage on the dynamic behavior of cam-follower systems. It was shown both theoretically and experimentally that a cracked cam causes an overall reduction in stiffness. To further probe the effect, investigators derived an analytical formula expressing the time varying stiffness of a cam-follower system. They also succeeded in quantifying the relationship between crack size and stiffness, showing that cracks have an amplitude modulating effect.
View PDF for content titled, Failure Analysis of a <span class="search-highlight">Cam</span>–Follower System Affected by a Crack
Image

Schematic representation of the cam– follower error. ( a ) Disk cam with an...

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in Failure Analysis of a Cam–Follower System Affected by a Crack > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 2 Schematic representation of the cam– follower error. ( a ) Disk cam with an offset translating roller follower. ( b ) Disk cam with translating roller follower More
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Modelling of the cam as non uniform cantilever beam. ( a ) Disk cam with an...

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in Failure Analysis of a Cam–Follower System Affected by a Crack > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 3 Modelling of the cam as non uniform cantilever beam. ( a ) Disk cam with an offset translating roller follower ( e ≠ 0). ( b ) Disk cam with translating roller follower ( e = 0) More
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Discretization of the cam. ( a ) Disk cam with an offset translating roller...

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in Failure Analysis of a Cam–Follower System Affected by a Crack > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 4 Discretization of the cam. ( a ) Disk cam with an offset translating roller follower ( e ≠ 0). ( b ) Disk cam with translating roller follower ( e = 0) More
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Fractured pin and gripping cam made from AISI S5 tool steel. (a) These frac...

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in Failures of Tools and Dies[1] > Failure Analysis and Prevention
Published: 01 January 2002
Fig. 26 Fractured pin and gripping cam made from AISI S5 tool steel. (a) These fractures occurred when the plate-lifting clamps containing these parts failed early in service. (b) As shown by this macroetched (10% aqueous nitric acid) pin, both the cam and the pin were heavily decarburized. (c More
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Section through the worn tip of a gray-iron cam lobe. The white islands are...

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in Failures Related to Casting > Failure Analysis and Prevention
Published: 01 January 2002
Fig. 41 Section through the worn tip of a gray-iron cam lobe. The white islands are free ferrite in a field of type D graphite. The matrix is ferritic. Etched with 2% nital. 235× More
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Fractured pin and gripping cam made from AISI S5 tool steel. (a) These frac...

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in Failures of Tools and Dies[1] > Analysis and Prevention of Component and Equipment Failures
Published: 30 August 2021
Fig. 26 Fractured pin and gripping cam made from AISI S5 tool steel. (a) These fractures occurred when the plate-lifting clamps containing these parts failed early in service. (b) As shown by this macroetched (10% aqueous nitric acid) pin, both the cam and the pin were heavily decarburized. (c More
Image

Section through the worn tip of a gray iron cam lobe. The white islands are...

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in Failures Related to Castings > Analysis and Prevention of Component and Equipment Failures
Published: 30 August 2021
Fig. 1 Section through the worn tip of a gray iron cam lobe. The white islands are free ferrite in a field of type D graphite. The matrix is ferritic. Etched with 2% nital. Original magnification: 235× More
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Fatigue fractures in fillet between shaft and side of cam lobe after applic...

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in Cracked Eccentric Camshaft > ASM Failure Analysis Case Histories: Machine Tools and Manufacturing Equipment
Published: 01 June 2019
Fig. 1 Fatigue fractures in fillet between shaft and side of cam lobe after application of magnaflux method. 1 × More
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Grinding checks on cam lobe side, after application of magnaflux method. 1 ...

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in Cracked Eccentric Camshaft > ASM Failure Analysis Case Histories: Machine Tools and Manufacturing Equipment
Published: 01 June 2019
Fig. 2 Grinding checks on cam lobe side, after application of magnaflux method. 1 × More
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Grinding check on cam lobe side. Etch: Nital. 100 ×

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in Cracked Eccentric Camshaft > ASM Failure Analysis Case Histories: Machine Tools and Manufacturing Equipment
Published: 01 June 2019
Fig. 6 Grinding check on cam lobe side. Etch: Nital. 100 × More
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Cold deformation and grinding martensite at surface of cam lobe side. Etch:...

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in Cracked Eccentric Camshaft > ASM Failure Analysis Case Histories: Machine Tools and Manufacturing Equipment
Published: 01 June 2019
Fig. 7 Cold deformation and grinding martensite at surface of cam lobe side. Etch: Nital. 200 × More
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Broken cam of a rolling mill clutch with many vibrational fractures origina...

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in Fatigue Fractures > ASM Failure Analysis Case Histories: Design Flaws
Published: 01 June 2019
Fig. 7 Broken cam of a rolling mill clutch with many vibrational fractures originating from a key-groove, Approx 1 2 × More
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Dynamic model of the cam–follower system

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in Failure Analysis of a Cam–Follower System Affected by a Crack > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 1 Dynamic model of the cam–follower system More
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Bending stiffness of the cam for a centered follower

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in Failure Analysis of a Cam–Follower System Affected by a Crack > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 7 Bending stiffness of the cam for a centered follower More
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Spectrum response of the follower acceleration. ( a ) Non-cracked cam and (...

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in Failure Analysis of a Cam–Follower System Affected by a Crack > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 10 Spectrum response of the follower acceleration. ( a ) Non-cracked cam and ( b ) cracked cam More
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Bending stiffness of the cam for a eccentric follower (5 mm)

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in Failure Analysis of a Cam–Follower System Affected by a Crack > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 14 Bending stiffness of the cam for a eccentric follower (5 mm) More
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Bending stiffness of the disk cam with translating roller follower ( e = 0...

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in Failure Analysis of a Cam–Follower System Affected by a Crack > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 15 Bending stiffness of the disk cam with translating roller follower ( e = 0). Bending stiffness of the disk cam with an offset translating roller follower ( e = 5 mm) More
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Contact force of the a disk cam with translating roller follower ( e = 0)

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in Failure Analysis of a Cam–Follower System Affected by a Crack > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 16 Contact force of the a disk cam with translating roller follower ( e = 0) More
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Contact force for a disk cam with an offset roller follower (Camshaft angul...

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in Failure Analysis of a Cam–Follower System Affected by a Crack > Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 17 Contact force for a disk cam with an offset roller follower (Camshaft angular velocity N = 800 rpm). ( a ) Cam without crack and ( b ) cam with crack More