Development of Drop-Hammer Compression Apparatus with Controlled Stopping Device and Its Application to Bonding Test
スポンサーリンク
概要
- 論文の詳細を見る
A Drop-hammer compression apparatus with a controlled stopping device is developed. A check test for the stopping device is carried out by compression of a short circular bar. The accuracy of the device is confirmed to be satisfactory for practical use. It works well without redundant jumping motion of the drop-hammer. Application of the apparatus is performed to the bonding test, in which two rectangular blocks piled-up with a sawtoothed interface are compressed under plane strain condition. Soft pure aluminum(A1050-O), soft and a quarter hard aluminum alloy(A5056-O, 1 / 4H)and pure copper(C1100-O, H)are used. The initial hammer velocity is set to be 10 m / s in the high rate test. The corresponding low speed test is also carried out. The sawtoothed interface is degreased by liquid acetone and the naturally oxidized surface layer is removed by use of a dilute sulfuric acid solution before the test. The bondability in low speed compression is generally better than that in high rate compression in the cases of A1050-O and C1100-H. Shear-band type strain localization followed by shear fracture occurs in high rate compression of A5056-O and -1 / 4H specimens, and their bondability is rather low in low speed compression. Moreover, with respect to the hard pure copper, it is also tested for the case where the sawtoothed interface is scratched by a steel wire brush after removal of the oxidized surface layer. The remarkable improvement of bondability in low speed is attained by the scratching operation. Furthermore, the strain-rate sensitivity exponent(m-value)for the high strain-rate(〜500 / s)of the tested materials is estimated by compressing a short circular bar, in which the method of direct comparison between the load-time curves by experiment and theory is used. The m-value of A1050-O is found 0.34, which is much higher than that for low speed compression. A5056 shows tendency such that its m-value decreases rapidly as the strain increases. The shear fracture of A5056 mentioned above may be due to this characteristics of its m-value.
- 一般社団法人日本機械学会の論文
- 1997-09-15
著者
-
Yamashita Minoru
Department Of Mechanical & Systems Engineering Gifu University
-
Yamashita M
Gifu Univ. Gifu Jpn
-
Gotoh Manabu
Department Of Mechanical & Systems Engineering Gifu University
-
FUJITA Eiichi
Graduate Student, Department of Mechanical Engineering, Gifu University
-
Fujita Eiichi
Graduate Student Department Of Mechanical Engineering Gifu University
関連論文
- Finite Element Simulation of Deformation of Fiber-Reinforced Materials in the Plastic Range : Model Proposition and Tensile Behaviors
- Finite-Element Simulation of Deformation and Breakage in Sheet Metal Forming : 2nd Report, An Elastic-Plastic Analysis of Square-Cup Drawing Process
- Finite-Element Simulation of Deformation and Breakage in Sheet Metal Forming : 1st Report, Basic Theory
- Fretting Fatigue Strength and Life Estimation in Ultra High Cycle Region Considering the Fretting Wear Process(Recent Advances in Materials and Processing (I))
- Analysis of the Localized Deformation of Sheet Metals Under Uniaxial tension
- Shape Imperfection in Cylindrical Cups Formed by Processes of Deep- and Stretch-Drawing with Ironing
- A Numerical Study of Dynamic Buckling of Thin-Walled Hollow Square Columns Subjected to Axial Impact(Computational Mechanics)
- Numerical Simulations of Unexpected Phenomena in Plane Strain Compression of Multilayered Blocks
- Unexpected Phenomena in Multilayered Copper Subjected to Plane Strain Compression
- Development of Drop-Hammer Compression Apparatus with Controlled Stopping Device and Its Application to Bonding Test
- Forming Limit Strain of Sheet Metals Subjected to Plane Strain Tension
- Shape Imperfection in Cylindrical Cups Formed by Processes of Deep- and Stretch-Drawing with Ironing : Three-Dimensional Radius Distribution of Cup Wall
- An Analysis of Axisymmetric Sheet Forming by the Shell Finite Element Method : (The Case Where Gotoh's Plastic Constitutive Equation and Fourth-Order Yield Function are Used)
- Plastic Properties of Metal-Metal Composites : A Numerical Investigation
- Effect of Out-of-Plane Stress on the Forming Limit Strain of Sheet Metals
- A Numerical Investigation of Cup-Forming by the Stretch-Drawing Process-Single and Double Operations
- On the Elastic-Plastic Constitutive Equations in Incremental Form
- Improvements of J_2-Deformation Theory and Their Applications to FEM Analyses of Large Elastic-Plastic Deformation
- CRUSH BEHAVIOR OF HONEYCOMB STRUCTURE IMPACTED BY DROP-HAMMER AND ITS NUMERICAL ANALYSIS
- Theoretical Prediction of Shear-Band-Type Strain Localization and Discussion on Its Relation to Fracture
- The Theoretical Prediction of Forming Limit Strains of Sheet Metals in Press-Forming Processes
- Durability of Cutting Performance of a Knife and Micro-Structural Change of a Knife Edge