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Shigeru Tanaka 1) Kazuyuki Hokamoto 2) Shigeru Itoh 2) 1)Kumamoto University

Explosive welding of aluminum plates. with aluminum wire mesh and WC powder. Shigeru Tanaka 1) Kazuyuki Hokamoto 2) Shigeru Itoh 2) 1)Kumamoto University 2)Shock Condensed Matter Research Center Kumamoto University. Contents. Background and Purpose.

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Shigeru Tanaka 1) Kazuyuki Hokamoto 2) Shigeru Itoh 2) 1)Kumamoto University

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  1. Explosive welding of aluminum plates with aluminum wire mesh and WC powder Shigeru Tanaka1) Kazuyuki Hokamoto2) Shigeru Itoh2) 1)Kumamoto University 2)Shock Condensed Matter Research Center Kumamoto University

  2. Contents Background and Purpose Shock penetration of diamond powder into aluminum plate Experiment Numerical simulation Conclusion Explosive welding of aluminum plates with aluminum wire mesh and WC powder Experiment Numerical simulation Conclusion Future works

  3. Background and Purpose Background Many automobile component parts are made from aluminum alloy. Heat release and wear resistant materials are required for some automobile components. Purpose of this study Investigation of adding hard materials to increase the properties of aluminum using two proposed methods – experimental and numerical study

  4. Explosive: SEP 5mm thickness (detonation velocity:7km/s, density: 1310kg/m3) Aluminum flyer and base plate (JIS: A-1050, 50x50x1.5mm) Diamond powder (10-20μm) Shock penetration of diamond powder into aluminum plate Experimental method Flyer plate Water proof seal 0.5mm thickness Diamond powder Base plate

  5. Shock penetration of diamond powder into aluminum plate Production of composite material in this study 2 1 3

  6. Shock penetration of diamond powder into aluminum plate Results 50mm 1.5mm 50μm Top view of recovered flyer plate (D=30mm) Cross sectional optical micrograph of the sample

  7. A(GPa) B(GPa) R1 R2 w 365 2.31 4.30 1.10 0.28 Shock penetration of diamond powder into aluminum plate Pressure calculation for explosive Explosive: SEP provided by Asahi Kasei corp. detonation velocity: 6970(m/s) detonation pressure: 15.9(GPa) JWL(Jones-Wilkins-Lee) equation of state for SEP explosive V= r 0(initial density of an explosive )/r (density of a detonation gas) P*: PressureE : specific internal energy A,B,R１,R２,w : JWL Parameter JWL parameter for explosive SEP

  8. Shock penetration of diamond powder into aluminum plate Burn technique of explosive / CJ volume burn method Detonation condition was decided by the reaction rate of explosives.(=W) A reaction rate W was calculated by the following formula: V0：Initial specific volume VCJ：Specific volume of C-J state The Pressure P inside the grating of explosives is calculated from the following formula: P*: Pressure calculated from JWL EOS

  9. P: pressure e : internal energy r0: initial density r: density Shock penetration of diamond powder into aluminum plate Pressure calculation for water and aluminum Mie-Grümeisen equation of state for water and aluminum Material constants 0 0

  10. Shock penetration of diamond powder into aluminum plate Investigation of flyer velocity PMMA Explosive Water 30mm Flyer plate

  11. Shock penetration of diamond powder into aluminum plate Relation between acceleration distance and flyer velocity

  12. Shock penetration of diamond powder into aluminum plate Simplified simulation of shock powder penetration

  13. Shock penetration of diamond powder into aluminum plate Conclusion It was realized that it is possible to make a aluminum based composite material by this method. From the numerical simulation, we could see that the particles are pushed by the particle which exists in a lower position. Problem This method is inapplicable to hard materials like stainless steel. Only few particles penetrated, while others remain between the plates.

  14. Cover plate Flyer plate Wire mesh Flyer plate WC powder Wire mesh Base plate Explosive welding of aluminum plates with aluminum wire mesh and WC powder Sample constitution 0.17mm

  15. Explosive welding of aluminum plates with aluminum wire mesh and WC powder Experimental method and conditions Experimental conditions

  16. 100μm 100μm Explosive welding of aluminum plates with aluminum wire mesh and WC powder Optical micrograph of recovered samples (When the distance, D is varied) No.2 (D=20mm) No.1 (D=10mm)

  17. 100μm Explosive welding of aluminum plates with aluminum wire mesh and WC powder Optical micrograph of recovered samples (When the layer is varied) 100μm No.4 (single layer ,D=30mm) No.3 (two layer,D=30mm)

  18. Explosive welding of aluminum plates with aluminum wire mesh and WC powder Magnified optical micrograph showing the crushed WC particles and aluminum 20μm No.1 (D=10mm)

  19. Explosive welding of aluminum plates with aluminum wire mesh and WC powder SEM image of fracture surface

  20. Explosive welding of aluminum plates with aluminum wire mesh and WC powder Investigation of pressure history PMMA Explosive 10mm Water 10mm 10mm 10mm Measurement points

  21. Explosive welding of aluminum plates with aluminum wire mesh and WC powder Numerically obtained results - pressure vs time

  22. Explosive welding of aluminum plates with aluminum wire mesh and WC powder Investigation of flyer velocity at 10mm 10mm SUS plate (0.1mmthickness) + aluminum plate (0.1mm thickness)

  23. Explosive welding of aluminum plates with aluminum wire mesh and WC powder Relation between acceleration distance and flyer velocity

  24. Explosive welding of aluminum plates with aluminum wire mesh and WC powder Simplified simulation and cross sectional view after etching Flyer plate WC particle Mesh wire Base plate

  25. Explosive welding of aluminum plates with aluminum wire mesh and WC powder Conclusion Good samples were recovered using this technique. Particles were crushed by collision of particles. Some traces of particle pull out was observed. There is a possibility of explosive welding between plates and mesh. Future works For the purpose of improvement of thermal conductivity of aluminum, Large sized diamond particles and aluminum wire mesh will be applied for making a Al-based composite material.

  26. Thank you for your kind attention

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