We developed a new type of impact test system using the Air-Slide that has less friction force generated between its moving part and the guide way. Dynamic force acting on a test piece is evaluated by measuring the velocity-time history of the moving part by an optical interferometer. Some cases on dynamic three-point bending tests for pure Aluminum bars are carried out. The dynamic force is estimated by both the proposed experimental way and the finite element analyses. Although a slight deviation between the results related to the fixed condition can be observed, the results show the validity of the test system especially for observing the material behavior under spontaneous unloading.

Schematic
of Air-Slide

Air-Slide
and the measuring system

(a) Time histories of dynamic load (b) Load-displacement curves

Measured
data obtained from dynamic three-point bending test

（Test piece: φ1.50mm aluminum rod, initial vel. of air-slide: 0.085m/s）

**Related papers (Journals):**

Y.Toi and D.Isobe: Adaptively Shifted Integration Technique in the Finite Element Collapse Analysis of Framed Structures, Journal of the Society of Naval Architects of Japan, Vol.171, (1992), pp.309-317, in Japanese. DOI: 10.2534/jjasnaoe1968.1992.309

Y.Toi and D.Isobe: Adaptively Shifted Integration Technique for Finite Element Collapse Analysis of Framed Structures, International Journal for Numerical Methods in Engineering, Vol.36, (1993), pp.2323-2339. DOI: 10.1002/nme.1620361402

Y.Toi and D.Isobe: Finite Element Analysis of Buckling Collapse Behaviors of Framed Structures by Using Adaptively Shifted Integration Technique, Journal of the Society of Naval Architects of Japan, Vol.174, (1993), pp.469-477, in Japanese. DOI: 10.2534/jjasnaoe1968.1993.174_469

Y.Toi and D.Isobe: Finite Element Analysis of Quasi-Static and Dynamic Collapse Behaviors of Framed Structures by the Adaptively Shifted Integration Technique, Computers and Structures, Vol.58, No.5, (1996), pp.947-955. DOI: 10.1016/0045-7949(95)00195-M

Y.Fujii, D.Isobe, S.Saito, H.Fujimoto and Y.Miki: A Method for Determining the Impact Force in Crash Testing, Mechanical Systems and Signal Processing, Vol.14, No.6, (2000), pp.959-965. DOI: 10.1006/mssp.1999.1272

D.Isobe, Y.Fujii and S.Saito: Experimental and Analytical Estimation of Measured Dynamic Force Obtained by Air-Slide Type Impact Test System, Transactions of the Japan Society of Mechanical Engineers, Series A, Vol.67, No.657, (2001), pp.799-806, in Japanese. DOI: 10.1299/kikaia.67.799

**Related papers (Proceedings):**

Y.Fujii, D.Isobe, S.Saito, H.Fujimoto and Y.Miki: A Method for Determining the Impact Force in Crash Testing, Proceedings of the 18th International Modal Analysis Conference, Vol.2, (2000), pp.1672-1677, San Antonio, USA. abstract