Philip Parkes | University of Bath (original) (raw)
Phil is currently undertaking a PhD in Mechanical Engineering at the University of Bath. The focus of his doctoral work is the development of a novel metal-composite joining technology called Hybrid Penetrative Reinforcement (HYPER).
The project is supported by Airbus Group Innovations. Supervision is by Prof. Richard Butler, Prof. Darryl Almond and Jonathan Meyer (Airbus Group).
MOTIVATION:
Development of this technology will allow ultra-strong and structurally efficient joining of metallic and composite structures.
APPROACH:
-Experimental testing to determine mechanical performance and failure characteristics
-Assessment of non-destructive testing methods for identification of defects/damage
-Development of modelling capability to allow simulation of defects/damage
Supervisors: Richard Butler
Address: Composites Research Unit
Department of Mechanical Engineering
University of Bath
Bath, BA2 7AY
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Papers by Philip Parkes
Proceedings of 54th AIAA/ASME/ASCE/AHS/ASC Structrues, Structural Dynamics and Materials Conference
An innovative, hybrid joining technology (HYPER) is investigated. Metal-composite single lap coup... more An innovative, hybrid joining technology (HYPER) is investigated. Metal-composite single lap coupons, reinforced with additively manufactured metallic pins, are subjected to high-cycle fatigue. A backface strain technique is used to identify damage initiation/growth and an ultrasonic inspection method is also used to help characterise failure. Fatigue life curves are generated and it is found that there is a discrete change in failure mode when load severity is reduced. High severity testing results in pin fracture above the pin root -similar to that observed during a previous static test programme. However, for high-cycle fatigue, at low loads, pins are torn from the adherend and cracks propagate through the stock material below the pin microstructure. It is proposed that this results from a change to the pin load mixity as joint rotation increases. Coupon failure is controlled and repeatable (for a given load severity) due to the sacrificial role of the pins and there is no significant damage to the composite adherend. Hence, it is believed that HYPER joints not only have excellent mechanical strength, compared to benchmark tests with bonded joints, but also offer greater potential for in-service repair than conventional, mechanically fastened joints.
Proceedings of 54th AIAA/ASME/ASCE/AHS/ASC Structrues, Structural Dynamics and Materials Conference
An innovative, hybrid joining technology (HYPER) is investigated. Metal-composite single lap coup... more An innovative, hybrid joining technology (HYPER) is investigated. Metal-composite single lap coupons, reinforced with additively manufactured metallic pins, are subjected to high-cycle fatigue. A backface strain technique is used to identify damage initiation/growth and an ultrasonic inspection method is also used to help characterise failure. Fatigue life curves are generated and it is found that there is a discrete change in failure mode when load severity is reduced. High severity testing results in pin fracture above the pin root -similar to that observed during a previous static test programme. However, for high-cycle fatigue, at low loads, pins are torn from the adherend and cracks propagate through the stock material below the pin microstructure. It is proposed that this results from a change to the pin load mixity as joint rotation increases. Coupon failure is controlled and repeatable (for a given load severity) due to the sacrificial role of the pins and there is no significant damage to the composite adherend. Hence, it is believed that HYPER joints not only have excellent mechanical strength, compared to benchmark tests with bonded joints, but also offer greater potential for in-service repair than conventional, mechanically fastened joints.