Estimation of Dynamic Interlaminar Fracture Toughness of CFRP by ENF Test Using SHPB Method.

Yamauchi, Yoshiaki; Kurokawa, Tomoaki; Kusaka, Takayuki

doi:10.2472/jsms.42.1445

Cited by 8 publications

(5 citation statements)

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“…Fig.2 represents a ramped incident wave generated by plastic deformation of metallic buffer placed at the impact end of input bar and successful results of transmitted wave without undulations. The method was applied to fracture characterization on several composites materials in various modes 20 . …”

Section: Bending Testmentioning

confidence: 99%

Historical Review of Research and Development of the SHPB Method in Japan

Ogawa¹

2008

Int. J. Mod. Phys. B

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Historical review of research and development of the SHPB method in Japan is outlined. After introduction of the SHPB in early 1960s, various kinds of compression, tension, torsion and bending tests have been performed in Japan and are presently shown together with special techniques such as the strain rate change test and the ramped wave method. Applications of the SHPB method to characterize dynamic response of materials from various points of view are also described in connection with its flexibility and simplicity. Current activities related to the SHPB method are briefly explained

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Section: Bending Testmentioning

confidence: 99%

Historical Review of Research and Development of the SHPB Method in Japan

Ogawa¹

2008

Int. J. Mod. Phys. B

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“…Because of this, improvement of interlaminar characteristics is necessary in order to improve the mechanical characteristics of mechanical joints in composite laminates. Although various studies have investigated ways to improve the interlaminar characteristics of composite laminates [5] [6] [7] [8] [9], here we focused on applying needle punching process to the reinforcement of the composite material as means of improving these characteristics. Needle punching process is a fabric processing method that is used to create non-woven fabric and is able to create interlacing of fabrics in the thickness direction by piercing cottony fiber with special barbed needles called felting needles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Needle Punching Process on a Chopped Strand Mat Composite with an Open Hole

Ichikawa¹,

Hamada²,

Ohtani³

2018

OJCM

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The easiest and most reliable joining method is the mechanical joint with a bolt and nut or rivet. However, in the case of composite laminates, mechanical joint properties decrease because of lower interlaminar properties compared to in-plane properties around hole. This study investigated needle punching process with the aim of improving the mechanical properties in the thickness direction of fiber-reinforced plastic composite laminates with an open hole. Needle punching process was applied to glass fiber chopped strand matused as the reinforcement for the composite laminates. Open-hole tensile tests and observations of end cross-sections after the tests were performed. The tensile properties and fracture mechanism of the specimens subjected to needle punching process were investigated. In addition, characteristic distance (a parameter for evaluating resistance to fracture in open-hole tensile test specimens) was also calculated to examine the effects of needle punching process conditions on fracture toughness. Tensile strength was improved by more than 15% by needle punching process. However, when a certain needle punching density was exceeded, the mechanical properties worsened. In addition, characteristic distance increased with increasing needle punching density. Thus, these results suggest that there is an optimal needle punching density with respect to strength and characteristic distance.

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“…In these studies, a hydraulic testing machine (loading rates of less than 0.1 m/s) [41, a drop weight testing system (1.25 to 3 m/s) [5,6], and the split Hopkinson pressure bar (SHPB) method (0.2 to 20 m/s) [7][8][9] were utilized in dynamic mode II interlaminar fracture tests. In the instrumented drop weight testing system, it is usually difficult to evaluate the load applied to the specimen accurately because periodic oscillation due to inertial effect and the multiple-reflection of the stress wave is normally observed in the load-time history when the load is measured from strain gages attached to the loading dart [10].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, it has been shown that it is possible to apply the static analyses to the dynamic testings even at relatively high rates if quasistatic stress states are achieved [7][8][9].…”

mentioning

confidence: 99%