New PDF release: The Scientific Papers of Sir Geoffrey Ingram Taylor

By Batchelor G.K. (ed.)

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Different functional groups on the glass surface have different polarity. Yet, we did not observe a significant difference in the water droplet contact angle measurements for the various surface treatments. Literature shows the contact angle is sensitive to both the reaction condition and also to the molecular topology [4]. It is a complex phenomenon affected by many factors and not directly related to the interfacial bonding properties, which is of greatest interest here. Nevertheless, it is a useful way to qualitatively evaluate the repeatability of surface treatment.

Sample sizes were chosen to accommodate for shear strength tests under tension (Fig. 2). Microscopic observations were made before subjecting the samples for destructive testing. Non-destructive testing on the welded samples was done using XRD. Diffraction was performed with Cu–Ka radiation at tube parameters of 40 kV/40 mA using a Bruker D8 Discover XRD2 micro-diffractometer equipped with the General Area Diffraction Detection System (GADDS) and Hi-Star 2D area detector. 02 resolution. 5 mm position accuracy.

When tested for their tensile lap joint shear strength, the samples exhibited a brittle failure in comparison with adhesives. 4 mm2 area. Laser welded lap joints exhibited the highest strength of 22 MPa in tension. However, the sample failed in a brittle fashion under bending. Micrographs of the laser welded regions of sample set-A are presented in Fig. 7. In the pulsed laser welded sample shown in Fig. 7a, there are traces of visible thermal ablation. This process occurs as a result of surface vaporization caused by a localized increase in temperature.

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The Scientific Papers of Sir Geoffrey Ingram Taylor (Mechanics of Solids) by Batchelor G.K. (ed.)


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