一体压铸铝合金自冲铆接接头裂纹及其对力学性能的影响

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中图分类号：U466 文献标志码：B DOI：10.19710/J.cnki.1003-8817.20250056

Abstract：Theinfluence of surface crackson therivet butonofSelf-PiercingRiveted （SPR） joints between DC01 steeland integrateddie-castaluminumalloyisinvestigatedusingmetallographicmicroscopy，industrial Computed Tomography（CT），and staticand fatigue mechanical testing.Statisticalanalysis indicates thatthelength and numberof rivet butonsurface cracks havenosignificant efectonthe tensileperformanceof the joints.Thespecimensare groupedaccording tocrack severity，andnonoticeablediferencesareobservedineither static tensilestrengthor fatigue lifeamong the groups.Although rivet button surface crackspropagate during both staticand fatigue loading， theyarenotidentifiedastheprimarycauseof jointfailure.Incontrast，theloading frequencyisfoundtohavea significant impact on the fatigue life of the SPR joints.

KeyWords：Integrated die-castingaluminumalloy，SPR，Cracks，Mechanical properties

1前言

获得显著的轻量化效果，乘用车单车用铝量正在逐步提高，其中又以铸造铝合金占比最大[3-4]。（剩余5011字）