Pure S0 and SH0 detections of various damage types in aerospace composites

Mei, Hanfei; Haider, Mohammad Faisal; James, Robin; Giurgiutiu, Victor

doi:10.1016/j.compositesb.2020.107906

Cited by 50 publications

(30 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If we were do conduct a preliminary inspection, we can see that SH0 mode is found stronger than the S0 mode. Previous work [25][26][27][28] has also indicated that SH0 mode is very sensitive to impact damage and can be used to detect impact damage. To perform the mode separation study for the AE due to the impact event, we first analyze the impact hits from the 1 J impact hit that caused no damage in a 2 mm composite coupon, and the 16 J impact hit that caused a 1" impact damage in a composite coupon.…”

Section: Mode Separation Study Of Ae Signals Due To Impact Eventmentioning

confidence: 99%

“…X-ray micro computed tomography is also being developed to give a 3D visualization of impact damage in composite structures through multiple B-scans and C-scans that can be observed at different orientations [23,24]. The authors of this paper are also exploring advanced guided wave propagation methods [25][26][27][28] for and long-distance propagation of the guided waves in the composite structure which will enable large area examination of the composite structures subjected to controlled impact damage creation.…”

Section: Introduction 1background and Motivationmentioning

confidence: 99%

See 1 more Smart Citation

Impact Damage Ascertainment in Composite Plates Using In-Situ Acoustic Emission Signal Signature Identification

2021

Self Cite

View full text Add to dashboard Cite

Barely visible impact damage (BVID) due to low velocity impact events in composite aircraft structures are becoming prevalent. BVID can have an adverse effect on the strength and safety of the structure. During aircraft inspections it can be extremely difficult to visually detect BVID. Moreover, it is also a challenge to ascertain if the BVID has in-fact caused internal damage to the structure or not. This paper describes a method to ascertain whether or not internal damage happened during the impact event by analyzing the high-frequency information contained in the recorded acoustic emission signal signature. Multiple 2 mm quasi-isotropic carbon fiber reinforced polymer (CFRP) composite coupons were impacted using the ASTM D7136 standard in a drop weight impact testing machine to determine the mass, height and energy parameters to obtain approximately 1” impact damage size in the coupons iteratively. For subsequent impact tests, four piezoelectric wafer active sensors (PWAS) were bonded at specific locations on each coupon to record the acoustic emission (AE) signals during the impact event using the MISTRAS micro-II digital AE system. Impact tests were conducted on these instrumented 2 mm coupons using previously calculated energies that would create either no damage or 1” impact damage in the coupons. The obtained AE waveforms and their frequency spectrums were analyzed to distinguish between different AE signatures. From the analysis of the recorded AE signals, it was verified if the structure had indeed been damaged due to the impact event or not. Using our proposed structural health monitoring technique, it could be possible to rapidly identify impact events that cause damage to the structure in real-time and distinguish them from impact events that do not cause damage to the structure. An invention disclosure describing our acoustic emission structural health monitoring technique has been filed and is in the process of becoming a provisional patent.

show abstract

Section: Mode Separation Study Of Ae Signals Due To Impact Eventmentioning

confidence: 99%

Section: Introduction 1background and Motivationmentioning

confidence: 99%

Impact Damage Ascertainment in Composite Plates Using In-Situ Acoustic Emission Signal Signature Identification

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…There is ongoing research on other non-destructive testing (NDT) techniques for more accurate evaluation and convenient implementation, such as acoustic emission (2)(3)(4)(5)(6)(7)(8) , guided waves (9)(10)(11)(12)(13)(14)(15)(16)(17)(18) (e.g. piezoelectric transducer-based (19,20) and angle beam transducer-based (21,22) ), air-coupled ultrasonics (23)(24)(25)(26)(27)(28)(29)(30) , thermography (31)(32)(33)(34)(35)(36) , optical fibre sensing (37)(38)(39)(40)(41)(42) , digital image correlation (DIC) (43)(44)(45)(46)(47)(48) , electromagnetic testing (49)(50)…”

Section: Introductionmentioning

confidence: 99%

Review of microwave techniques used in the manufacture and fault detection of aircraft composites

Li¹,

Wang²,

Haigh³

et al. 2020

Aeronaut. j.

View full text Add to dashboard Cite

Microwaves are a form of electromagnetic radiation commonly used for telecommunications, navigation and food processing. More recently microwave technologies have found applications in fibre-reinforced polymer composites, which are increasingly used in aircraft structures. Microwave energy can be applied with low power (up to milliwatts) for non-destructive testing and high power (up to kilowatts) for heating/curing purposes. The state-of-the-art applications at high power include curing, three-dimensional (3D) printing, joining and recycling, whereas low-power microwave techniques can provide quality checks, strain sensing and damage inspection. Low-power microwave testing has the advantage of being non-contact, there is no need for surface transducers or couplants, it is operator friendly and relatively inexpensive; high-power microwave energy can offer volumetric heating, reduced processing time and energy saving with no ionising hazards. In this paper the recent research progress is reviewed, identifying achievements and challenges. First, the critical electromagnetic properties of composites that are closely related to the heating and sensing performance are discussed. Then, representative case studies are presented. Finally, the trends are outlined, including intelligent/automated inspection and solid-state heating.

show abstract

“…Guided waves can be used to detect different types of defects in plate-like structures, including delaminations [ 9 , 10 ] in composites. The possibility of damage detection in aerospace composite has been investigated using both S0 and SH0 modes [ 11 ]. The work in this paper concentrates on these two modes, although A0 modes can also be useful because of their smaller wavelength.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Guided Wave Directivity Patterns of Thin Removable Magnetostrictive Patches

Zitoun

Dixon

Edwards³

et al. 2020

Sensors

View full text Add to dashboard Cite

The characteristics of removable magnetostrictive thin patches are investigated for the generation of guided waves in plates. The directivity patterns of SH, S0 and A0 modes have been measured in a thin metallic plate for different combinations of static and dynamic magnetic field directions. This used different coil geometries such as racetrack and spiral coils to generate the dynamic magnetic field, as well as separate biasing static magnetic fields from permanent magnets. This arrangement generated signals via both Lorentz and magnetostrictive forces, and the resultant emitted guided waves were studied for different dynamic and static magnetic field directions and magnitudes. It is demonstrated that different guided wave modes can be produced by controlling these parameters.

show abstract

Pure S0 and SH0 detections of various damage types in aerospace composites

Cited by 50 publications

References 44 publications

Impact Damage Ascertainment in Composite Plates Using In-Situ Acoustic Emission Signal Signature Identification

Impact Damage Ascertainment in Composite Plates Using In-Situ Acoustic Emission Signal Signature Identification

Review of microwave techniques used in the manufacture and fault detection of aircraft composites

Experimental Study of the Guided Wave Directivity Patterns of Thin Removable Magnetostrictive Patches

Contact Info

Product

Resources

About