Assessment of the Fatigue Cracking Impact and Optimization of Operating Conditions of a Hydraulic Hammer Anvil
Two main cracks appear on the upper end of the inner hole of a hammer anvil after 130 hours’ impact. The fracture morphology, microstructure, metallographic microscopy results and nonmetallic inclusions of the cracked anvil are analyzed. The chemical composition and mechanical properties of the anvi...
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| Veröffentlicht in: | Strength of materials 2020, Vol.52 (1), p.110-117 |
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| creator | Zhang, H. P. Sun, M. G. Suo, Z. W. |
| description | Two main cracks appear on the upper end of the inner hole of a hammer anvil after 130 hours’ impact. The fracture morphology, microstructure, metallographic microscopy results and nonmetallic inclusions of the cracked anvil are analyzed. The chemical composition and mechanical properties of the anvil are examined. In its material, carbon content is shown to be higher than the highest limit of 40CrMnMo specifications, with multiple sulfide inclusions, which affects the comprehensive mechanical properties to some extent. The cracks originate from mechanical fatigue, propagating from the stress concentration point near the upper end of the inner hole. Low material toughness and high local working stresses are the main contributors of fatigue cracking. The lines of optimizing the operating conditions and improving the anvil structure and material are put forward. |
| doi_str_mv | 10.1007/s11223-020-00156-z |
| format | Article |
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P.</creatorcontrib><creatorcontrib>Sun, M. G.</creatorcontrib><creatorcontrib>Suo, Z. W.</creatorcontrib><title>Assessment of the Fatigue Cracking Impact and Optimization of Operating Conditions of a Hydraulic Hammer Anvil</title><title>Strength of materials</title><addtitle>Strength Mater</addtitle><description>Two main cracks appear on the upper end of the inner hole of a hammer anvil after 130 hours’ impact. The fracture morphology, microstructure, metallographic microscopy results and nonmetallic inclusions of the cracked anvil are analyzed. The chemical composition and mechanical properties of the anvil are examined. In its material, carbon content is shown to be higher than the highest limit of 40CrMnMo specifications, with multiple sulfide inclusions, which affects the comprehensive mechanical properties to some extent. The cracks originate from mechanical fatigue, propagating from the stress concentration point near the upper end of the inner hole. Low material toughness and high local working stresses are the main contributors of fatigue cracking. The lines of optimizing the operating conditions and improving the anvil structure and material are put forward.</description><subject>Analysis</subject><subject>Carbon content</subject><subject>Characterization and Evaluation of Materials</subject><subject>Chemical composition</subject><subject>Chemistry and Materials Science</subject><subject>Classical Mechanics</subject><subject>Crack propagation</subject><subject>Fatigue</subject><subject>Fatigue cracking</subject><subject>Fatigue cracks</subject><subject>Fatigue failure</subject><subject>Fatigue testing machines</subject><subject>Fracture mechanics</subject><subject>Job stress</subject><subject>Materials</subject><subject>Materials Science</subject><subject>Mechanical properties</subject><subject>Morphology</subject><subject>Nonmetallic inclusions</subject><subject>Optimization</subject><subject>Solid Mechanics</subject><subject>Stress concentration</subject><subject>Stress propagation</subject><issn>0039-2316</issn><issn>1573-9325</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9kV2LEzEUhoMoWFf_gFcBr7yY9SRpZprLUlxbWCj4cR0ymZMxayczJhnZ7a83tQtLYZFchLw8Tw6Hl5D3DK4ZQPMpMca5qIBDBcBkXR1fkAWTjaiU4PIlWQAIVXHB6tfkTUp3ALBiYrUgYZ0SpjRgyHR0NP9EemOy72ekm2jsLx96uhsmYzM1oaP7KfvBHwsxhhO_nzCWR4E2Y-j8KU6n3NDtQxfNfPCWbs0wYKTr8Mcf3pJXzhwSvnu8r8iPm8_fN9vqdv9lt1nfVlY0LFeOgcUWLdZCtp1acYXLTtWIljsjARvRuta6Bpat5K5TqnVKLY1gQhkHrRRX5MP53ymOv2dMWd-NcwxlpOZL4BKkqsUT1ZsDah_cmMvOg09Wr2suVrxpGlao62eocjocvB0DOl_yC-HjhVCYjPe5N3NKevft6yXLz6yNY0oRnZ6iH0x80Az0qVp9rlaXavW_avWxSOIspQKHHuPTdv-x_gK7bqZe</recordid><startdate>2020</startdate><enddate>2020</enddate><creator>Zhang, H. 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W.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c371t-f10cebece635bd9829e4d96eec2fa50e73bfbcf704b52fd99bf994a3139af0b53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Analysis</topic><topic>Carbon content</topic><topic>Characterization and Evaluation of Materials</topic><topic>Chemical composition</topic><topic>Chemistry and Materials Science</topic><topic>Classical Mechanics</topic><topic>Crack propagation</topic><topic>Fatigue</topic><topic>Fatigue cracking</topic><topic>Fatigue cracks</topic><topic>Fatigue failure</topic><topic>Fatigue testing machines</topic><topic>Fracture mechanics</topic><topic>Job stress</topic><topic>Materials</topic><topic>Materials Science</topic><topic>Mechanical properties</topic><topic>Morphology</topic><topic>Nonmetallic inclusions</topic><topic>Optimization</topic><topic>Solid Mechanics</topic><topic>Stress concentration</topic><topic>Stress propagation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhang, H. P.</creatorcontrib><creatorcontrib>Sun, M. G.</creatorcontrib><creatorcontrib>Suo, Z. W.</creatorcontrib><collection>CrossRef</collection><collection>Gale In Context: Science</collection><jtitle>Strength of materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhang, H. P.</au><au>Sun, M. G.</au><au>Suo, Z. W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Assessment of the Fatigue Cracking Impact and Optimization of Operating Conditions of a Hydraulic Hammer Anvil</atitle><jtitle>Strength of materials</jtitle><stitle>Strength Mater</stitle><date>2020</date><risdate>2020</risdate><volume>52</volume><issue>1</issue><spage>110</spage><epage>117</epage><pages>110-117</pages><issn>0039-2316</issn><eissn>1573-9325</eissn><abstract>Two main cracks appear on the upper end of the inner hole of a hammer anvil after 130 hours’ impact. 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| subjects | Analysis Carbon content Characterization and Evaluation of Materials Chemical composition Chemistry and Materials Science Classical Mechanics Crack propagation Fatigue Fatigue cracking Fatigue cracks Fatigue failure Fatigue testing machines Fracture mechanics Job stress Materials Materials Science Mechanical properties Morphology Nonmetallic inclusions Optimization Solid Mechanics Stress concentration Stress propagation |
| title | Assessment of the Fatigue Cracking Impact and Optimization of Operating Conditions of a Hydraulic Hammer Anvil |
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