Impact Response of Glass Fiber Composites

Pravinkumar Ramchandra Ghodake

Department of Mechanical Engineering, Indian Institute of Technology, Kanpur, India.

Drop Weight Impact:

Introduction:

Bullet Impact:

Acknowledgement:

Hopkinson Pressure Bar (HPB) Impact:

• 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.

• 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.

• Developing Bullet Impact setup integrated with 3D DIC.

• 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.

Conclusions:

Cameras

HPBComposite Plate

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

1000 µs

1200 µs

1400 µs

1600 µs

2000 µs

2200 µs

2400 µs

2600 µs

2800 µs

3000 µs

3000 µs

3200 µs

3400 µs

3600 µs

3800 µs

Gas Cylinder

Camera

High Intensity Light

Composite Plate

• 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.

• 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.

Response of Composites

Damage on Impacted Face

Conclusions:

• Found damage patterns using image processing technique.

• Significant change in damages or damage modes observed

as impact energy increases.

Damage on Non-Impacted Face

t = 400 µs

70 mm