| 41. | It was caused by a cracked exhaust valve, resulting from metal fatigue in an engine cylinder.
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| 42. | Still unexplained is whether the wheel broke apart due to metal fatigue, or some outside force.
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| 43. | My back was doing its own version of metal fatigue by the time I reached the junkyard.
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| 44. | Officials blamed the failure on metal fatigue.
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| 45. | Probable cause of crash : metal fatigue.
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| 46. | Unfortunately, it is prone to metal fatigue.
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| 47. | We have not ruled out metal fatigue.
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| 48. | Composite materials are strong, lightweight, impervious to corrosion and metal fatigue, and increasingly popular with airplane designers.
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| 49. | Some aviation experts have suggested that metal fatigue might have caused the 22-year-old plane to break up.
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| 50. | So, was there a case metal fatigue?
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