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            Description

            • Contact fatigue damage occurring before the expected service life may be primary or secondary damage
            • Primary premature contact fatigue results from adverse or unaccounted for running conditions
            • Secondary premature contact fatigue results from crack initiation and propagation from surface damage

            Causes

            • Heavier loads than expected
            • Excessive preloading or loss of clearance due to incorrect fits or thermal expansion
            • Misalignment
            • Surface damage and geometrical nonconformities (roundness/taper) of housing or shaft seats
            • Shaft/housing deflection under load
            • Changes in contact geometry resulting from wear
            • Surface Damage
              • Handling and Installation damage – denting, smearing
              • Corrosion – acid etching, rust
              • Fine grain spalling (micropitting) due to marginal lubrication
              • Impact damage (brinelling)
              • Vibration damage (false brinelling)
              • Electrical current damage
            Contact fatigue spalling on a cone raceway resulting from edge loading due to misalignment and heavy loading.

            Contact fatigue spalling on a cone raceway resulting from edge loading due to misalignment and heavy loading.

            Contact fatigue spalling on a cylindrical inner race resulting from isolated surface damage.

            Contact fatigue spalling on a cylindrical inner race resulting from isolated surface damage.

            Contact fatigue spalling on a cylindrical outer race resulting from surface corrosion.

            Contact fatigue spalling on a cylindrical outer race resulting from surface corrosion.

            Contact fatigue spalling on a cylindrical outer race resulting from misalignment.

            Contact fatigue spalling on a cylindrical outer race resulting from misalignment.

            Contact fatigue spalling on a cone raceway resulting from impact damage (brinelling).

            Contact fatigue spalling on a cone raceway resulting from impact damage (brinelling).

            Contact fatigue spalling at surface distress (micropitting) resulting from marginal lubrication.

            Contact fatigue spalling at surface distress (micropitting) resulting from marginal lubrication.

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