PSI - Issue 39

Szymon Derda et al. / Procedia Structural Integrity 39 (2022) 441–449 Author name / Structural Integrity Procedia 00 (2019) 000–000

443

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as Case 1, was manufactured with the use of 1.5 mm Tantalum, 1.5 mmm M1E Copper, and 10 mm P355 NL2 Steel. The second one, Case 2, incorporated 1.5 mm Tantalum, 3 mm M1E Copper, and 304L Stainless Steel. Both materials were produced in the form of plates with dimensions of 500 mm by 250 mm. The stand-off distance between each plate was equal to 2 mm. The setup has resulted in impact velocity between colliding plates equal to 350 and 337 m/s respectively for Case 1 and 2. Further information on the manufacturing process and its thorough description can be found in [10]. All the information was summarized in Tables 1 and 2.

Table 1 Description of Case 1 composite

Material Tantalum

Thickness, mm

Task

1.5 1.5

Corrosion resistance

Copper

Heat dissipation

P355 NL2 Steel

10

Mechanical strength

Table 2 Description of Case 2 composite

Material Tantalum

Thickness, mm

Task

1.5

Corrosion resistance

Copper

3 8

Heat dissipation

304L Stainless Steel

Mechanical strength

2.2. Interface characteristics Explosively welded materials have a characteristic wavy interface between joined layers. Depending on the component materials, differences in properties of adjacent layers, and process parameters the interface shape can vary. It is common to describe the interface with simplified values referring to the geometry of a basic waveform, namely: height and length. In Fig. 1 exemplary photographs of both interfaces present in the Case 2 composite were shown. Three specimens from Case 1 and five specimens from Case 2 were carefully inspected in terms of interface geometry. Based on these observations, waves' heights and lengths were measured and visualized in Fig. 2. In both cases, the interface between Copper and Tantalum is flatter and more regular than the one between Copper and Steel. Values identified at Cu/SS are several times greater than those at Cu/S.

Fig. 1 Exemplary interface between layers in the specimen of Case 2