Effect of adhesive on peel strength of heterogeneous clinched joints under acidic environment
To explore the effects of adhesive on peel strength of heterogeneous clinched joints under acidic environment,taking the hot-rolled dual-phase steel DP590 and AA5052 as the raw materials,and 0.02 mol·L-1 NaHSO3 solution as the corrosion solution,the het-erogeneous clinched joints(clinched joints)and bonding-clinched joints(clinch-bonded hybrid joints)were subjected to wet-dry cyclic immersion alternate corrosion experiments.The static properties and failure mechanism of the joints under acidic environment were studied by static experiments,micro-failure fracture and energy spectrum analysis.The results show that the maximum failure load of the joints are significantly increased by using adhesive,and the bearing capacity of the clinch-bonded hybrid joints are 56.3％higher than that of the clinched joints.The use of the adhesive has no effect on the failure mode of the joints.When the corrosion time is 0 h,the failure modes of both clinched joints and clinch-bonded hybrid joints are internal lock pulling-out failure,but with the progress of corrosion,the failure mode gradually changes to neck fracture failure.The microscopic fracture morphologies of the upper plate of the clinch-bonded joints are characterized by dimples,and the slip marks at the tensile failure site of the lower plate gradually deepen.The surface element character-istics of the overlap area of the clinched joints under acid corrosion environment are more obvious than that of the clinch-bonded hybrid joints,indicating that the use of the adhesive has a certain protective effect on the clinched joints.
万方数据
维普
