Chapter 33
Experiment Research on Acoustic
Emission of Impact-Damaged
Fully-Wrapped Composite Gas Cylinder
with Non-metallic Liner
Ke Bo, Sanjiang Liu, Liang Cheng, Yilin Yuan, and Hui Luo
Abstract The acoustic emission (AE) was used to monitor the impact damage of
full-wrapped composite cylinder with non-metallic liner. The results showed that AE
technique was capable of monitoring the accumulation of impact damage events in
this type of cylinder. Hit number and AE energy were the effective AE signal discriminators. The results provided an experimental basis for cylinder impact damage
evaluation of full-wrapped composite cylinder with non-metallic liner.
33.1 Introduction
Fully-wrapped composite gas cylinders with non-metallic liner (type 4 cylinders) are
widely used for filling LPG gas in the world, because of their attractive advantages,
such as light weight, high strength, good fatigue and anti-corrosion performance.
For type 4 cylinders, composite was a key factor to ensure safety due to non-load
sharing of liner materials. Impact damage, cuts and abrasions were the common
damage modes of type 4 cylinder. The fiber was directly cut or removed in the
laminate and laminate strength was reduced at the points surrounding the damage
[1]. Fatigue crack may generate nearby the damage and develop as the cylinder
undergoes in-service pressure cycles [2]. Cuts and abrasions could be inspected
by visible inspection. However, impact damage which was not inspected easily by
general tests might cause matrix cracking, delamination and fiber fracture, which
will directly affected the safety of impact damaged cylinder. It’s well known that
failure of composite was not an abrupt and catastrophic event, but instead damage
develops progressively in service by the accumulation of fibre failures and other
microstructural failure events [3]. Therefore, acquiring information of development
of impact damage to evaluate the structural condition and determine that whether the
cylinder can be used safely is essential.
K. Bo · S. Liu (B) · L. Cheng · Y. Yuan · H. Luo
China Special Equipment Inspection and Research Institute, Beijing 100013, China
e-mail: boke2@163.com
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
G. Shen et al. (eds.), Advances in Acoustic Emission Technology, Springer Proceedings
in Physics 259, https://doi.org/10.1007/978-981-15-9837-1_33
383
Experiment Research on Acoustic
Emission of Impact-Damaged
Fully-Wrapped Composite Gas Cylinder
with Non-metallic Liner
Ke Bo, Sanjiang Liu, Liang Cheng, Yilin Yuan, and Hui Luo
Abstract The acoustic emission (AE) was used to monitor the impact damage of
full-wrapped composite cylinder with non-metallic liner. The results showed that AE
technique was capable of monitoring the accumulation of impact damage events in
this type of cylinder. Hit number and AE energy were the effective AE signal discriminators. The results provided an experimental basis for cylinder impact damage
evaluation of full-wrapped composite cylinder with non-metallic liner.
33.1 Introduction
Fully-wrapped composite gas cylinders with non-metallic liner (type 4 cylinders) are
widely used for filling LPG gas in the world, because of their attractive advantages,
such as light weight, high strength, good fatigue and anti-corrosion performance.
For type 4 cylinders, composite was a key factor to ensure safety due to non-load
sharing of liner materials. Impact damage, cuts and abrasions were the common
damage modes of type 4 cylinder. The fiber was directly cut or removed in the
laminate and laminate strength was reduced at the points surrounding the damage
[1]. Fatigue crack may generate nearby the damage and develop as the cylinder
undergoes in-service pressure cycles [2]. Cuts and abrasions could be inspected
by visible inspection. However, impact damage which was not inspected easily by
general tests might cause matrix cracking, delamination and fiber fracture, which
will directly affected the safety of impact damaged cylinder. It’s well known that
failure of composite was not an abrupt and catastrophic event, but instead damage
develops progressively in service by the accumulation of fibre failures and other
microstructural failure events [3]. Therefore, acquiring information of development
of impact damage to evaluate the structural condition and determine that whether the
cylinder can be used safely is essential.
K. Bo · S. Liu (B) · L. Cheng · Y. Yuan · H. Luo
China Special Equipment Inspection and Research Institute, Beijing 100013, China
e-mail: boke2@163.com
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
G. Shen et al. (eds.), Advances in Acoustic Emission Technology, Springer Proceedings
in Physics 259, https://doi.org/10.1007/978-981-15-9837-1_33
383