Impact Response of Glass Fiber Composites (Poster)

Impact Response of Glass Fiber Composites Pravinkumar Ramchandra Ghodake Department of Mechanical Engineering, Indian Institute of Technology, Kanpur, India. Introduction:

Hopkinson Pressure Bar (HPB) Impact:

• Impact response of composite materials is one of the important areas of interest in aerospace industries. • Delamination growth, matrix damage and fiber failure are some of the major damage modes in failure under impact. • These damages significantly affect the impact response of composite.

• HPB diameter is 20 mm with indenter diameter 16 mm. • Momentum Trap is used to avoid repeated loading. • 3D DIC is used for measuring out-of-plane displacement profile of plate. Cameras

Drop Weight Impact: • Epoxy-glass fiber composite is prepared using hand layup and vacuum bagging method. • Specimens of 100 mm × 100 mm size with laminate sequence of [0/90/+45/-45] are prepared. • INSTRON CEAST 9340 with impactor mass 3.13 kg is used.

t = 400 µs

HPB Composite Plate

70 mm

Back face profiles from 0 to 3800 µs with 40 µs interval.

0 µs 0 µs 0 µs (Loading Started) 200 µs 400 µs 600 µs 800 µs 1000 µs

Response of Composites

3000 µs 3200 µs 3400 µs 3600 µs 3800 µs

1000 µs 1200 µs 1400 µs 1600 µs 2000 µs 2200 µs 2400 µs 2600 µs 2800 µs 3000 µs

Conclusions: • Accumulation of profiles at maximum force during loading indicates local fiber breakage. • Accumulation of profiles during unloading shows mixing or overlapping of locally broken fibers inside the layer.

Bullet Impact: • Developing Bullet Impact setup integrated with 3D DIC.

Composite Plate

Damage on Impacted Face Gas Cylinder

Camera High Intensity Light

Damage on Non-Impacted Face

Conclusions: • Found damage patterns using image processing technique. • Significant change in damages or damage modes observed as impact energy increases.

Acknowledgement: • Dr. P. Venkitanarayanan (Thesis Supervisor), Department of Mechanical Engineering, Indian Institute of Technology, Kanpur, India. • Dr. Rajesh Kitey, Department of Aerospace Engineering, Indian Institute of Technology, Kanpur, India. • Manoj Gautam, Chandra Prakash, Anurag Goel, B. D. Pandey, Ravi Sankar.