Effects Of Bonding Parameters Research Articles

The bonding properties and interfacial morphologies of clad plate prepared by multiple passes hot rolling in a protective atmosphere

SUS304 stainless steel and plain carbon steel were first bonded by hot rolling in an argon atmosphere and were subsequently hot-rolled by multiple passes in air. Shearing and peeling tests were performed according to appropriate standards to evaluate the bonding results. The interfacial microstructures, composition diffusion and peeling fractographies of the clad plate samples were used to examine the bond quality. The effects of bond parameters on the bond properties of clad plate were studied. The experimental results indicate that the shear strength reaches 266MPa, and the peel strength is up to 322N/mm at 1323K in the first pass, representing a reduction of 24.3%. Both the shear strength and the peel strength increase with increases in bonding temperature and total reduction ratio. The maximum shear strength reaches 361MPa, and the peel strength is up to 510N/mm at 1323K after six passes with a total reduction ratio of 74.8%. Both the dimension and number of interfacial pores decrease rapidly with increasing rolling passes. Multipass hot rolling generates a number of local embedments at the interface and improves the interfacial bonding strength.

Effects of Bond Parameters on Hydrogen Storage Capacity of Ti-V-Cr BCC Phase Alloys

Abstract The relation between the effective hydrogen storage capacity C H of Ti-V-Cr alloys and out-layer electrons, atomic diameter difference, electronegativity difference has been studied. It is shown that their relation can be expressed as T ln C H = 0.45922 T + 5044.8 (Δ X ) 2 + 1250.6 δ 2 −285.80 n 2/3 . The factor of out-layer electrons has the largest effect on the C H of Ti-V-Cr alloys, while the factor of electronegativity difference has the smallest effect among the three bond parameters. The effective hydrogen storage capacity of Ti-V-Cr alloys is greater than 2.0wt% when n 2/3 values of Ti-V-Cr alloys are between 1.98 and 2.14, δ 2 values are between 0.255 and 0.288 and (Δ X ) 2 values are between 0.0638 and 0.0765.

Effects of bond parameters on fatigue characteristics of a cocured double lap joint subjected to cyclic tensile loads

A cocured joint whose manufacturing process is simpler than that of an adhesively bonded joint is attractive for composite structures due to its several benefits. Fatigue behavior in the cocured joint is important because under alternating loads it will fail at stress levels much lower than it can withstand under monotonic loading. Although some researchers have recently reported on cocured joints, there are only a few articles published on the fatigue characteristics of cocured joints. In this article, effects of bond parameters on fatigue characteristics of a steel-composite cocured double lap joint under cyclic tensile loads were experimentally investigated. In order to observe stress distributions near the interface edge of the cocured double lap joint, finite element analysis was also performed. We considered the surface roughness of the steel adherend and the stacking sequence of the composite adherend as bond parameters. A fatigue failure mechanism of the cocured double lap joint was explained systematically by investigating the surfaces of failed specimens and stress distributions at the interface edge. Failure criteria of the cocured double lap joint under cyclic tensile loads were shown graphically.

Bond Parameters to Improve Tensile Load Bearing Capacities of Co-Cured Single and Double Lap Joints with Steel and Carbon Fiber-epoxy Composite Adherends

A co-cured joining method has several advantages over an adhesivelybonded joining method for its simple manufacturing process. It requires neither an adhesive nor surface treatment of the composite adherend and uses excess resin to bond both adherends, including composite adherend. In this paper, the effects of bond parameters, including surface roughness on the steel adherend, stacking sequence of the composite adherend, and manufacturing pressure in the autoclave during the bonding process, on tensile load bearing capacities of plate-type co-cured single and double lap joints were investigated experimentally. Bond parameterswere related to interfacial parameterssuch asa contact area and adhesive thickness, which affected the joint strength. Experimental results were explained with respect to all of interfacial parameters and bond parameters through investigating failure surfaces of the steel adherend and a lot of data of tensile load bearing capacities. In order to predict tensile load bearing capacities of co-cured single and double lap joints, we considered two different failure models using stress distributions in both co-cured lap joints obtained from finite element analysis. Finally, optimal conditions to improve the joint strength of co-cured single and double lap joints have been presented.