Safety &amp; Certification Initiatives for Composite Airframe Structure

Ilcewicz, Larry B.; Murphy, Brian T.

doi:10.2514/6.2005-1877

Cited by 14 publications

(9 citation statements)

References 4 publications

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“…The total number of tests performed at the subcomponent level (305) is much smaller than those performed at the coupon and element levels (8059). Usually, only two full-scale test articles are built and tested to validate the whole analysis process: one for static strength assessment and the other for durability and damage tolerance purposes [1] (Chapter 4), [2] (Chapters 6 and 7), and [5][6][7][8][9][10][11][12].…”

Section: Certification Methodologies and The Building Block Approachmentioning

confidence: 99%

Composite Materials Strength Determination Within the Current Certification Methodology for Aircraft Structures

Feraboli

2009

Journal of Aircraft

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Although several composite failure criteria have been proposed over the years to predict the static strength of polymer composites, including micromechanical and first-ply failure theories, none of them has demonstrated an ability to predict the onset of damage across the wide range of load conditions and structural configurations. For that reason, current aerospace practice uses empirically derived laminate-based allowables to demonstrate compliance with regulatory requirements for static strength. Some examples of certification by analysis supported by test evidence as well as certification by test are given, and the fundamental differences are highlighted in the context of the building block philosophy. The lack of accepted failure criteria and general material-degradation models for the prediction of damage initiation and propagation provides the background for the current methodology, which relies either on testing alone or on analysis supported by extensive test evidence.

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Section: Certification Methodologies and The Building Block Approachmentioning

confidence: 99%

Composite Materials Strength Determination Within the Current Certification Methodology for Aircraft Structures

Feraboli

2009

Journal of Aircraft

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“…Federal Aviation Administration) and large companies (e.g. Boeing) [75]. Engineering expertise and safety culture play an important role in developing regulation, but once created, the resulting specifications do not usually require further debate.…”

Section: B Optimization: What Is the Relationship Between The System ...mentioning

confidence: 99%

Axes for Sociotechnical Inquiry in AI Research

Dean

Gilbert²,

Zick

2021

IEEE Trans. Technol. Soc.

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The development of artificial intelligence (AI) technologies has far exceeded the investigation of their relationship with society. Sociotechnical inquiry is needed to mitigate the harms of new technologies whose potential impacts remain poorly understood. To date, subfields of AI research develop primarily individual views on their relationship with sociotechnics, while tools for external investigation, comparison, and cross-pollination are lacking. In this paper, we propose four directions for inquiry into new and evolving areas of technological development: value-what progress and direction does a field promote, optimization-how the defined system within a problem formulation relates to broader dynamics, consensus-how agreement is achieved and who is included in building it, and failurewhat methods are pursued when the problem specification is found wanting. The paper provides a lexicon for sociotechnical inquiry and illustrates it through the example of consumer drone technology.

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“…Over the last decades, several industrial sectors including automotive [1], aerospace [2] and energy [3,4] have focused their attention on composite materials, which improve the general performance of structures due to their high in-plane mechanical properties and low weight [5]. However, these materials show weak resistance against dynamic loading along the through the thickness direction due to their intrinsic stratified nature.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Silica-Based Shear Thickening Fluid in Enhancing Composite Impact Resistance

2020

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Laminated composite structures have attracted the interest of the modern industry due to their high performances and reduced weight when compared to traditional structural materials. However, they are very sensitive towards out-of-plane dynamic loading that can generate Barely Visible Impact Damage (BVID) within the structure and cause a drastic detriment of mechanical properties. One solution is proposed to overcome this problem by the hybridisation of the laminate stacking sequence using Shear Thickening Fluids (STFs) for absorption of large fractions of impact energy with a minimal damage generation. This work numerically investigated the impact response of Carbon Fibre Reinforced Polymers (CFRP) when a silica-based STF is embedded within the lamination sequence utilising an innovative Ls-Dyna-based Finite-Element Model (FEM). This was developed using an Arbitrary Lagrangian Element (ALE) approach in a fluid-structure interaction (FSI) analysis and calibrated with an experimental impact campaign to determine the best impact resistance as a function of the STF position along the thickness of the laminate. The results showed an improvement in impact resistance for all the hybrid configurations identifying the optimal STF location in the upper portion of the laminate with a reduction in absorbed energy of~42%, damaged area of~35% alongside an increase in contact force (~36%) with respect to conventional laminate with same stacking sequence and number of plies. The results showed that STF/CFRP structures can be successfully employed for applications in several advanced sectors including aerospace, automotive and energy (wind blades) representing an important step-up in the development of high-impact resistant hybrid composite structures.

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Safety & Certification Initiatives for Composite Airframe Structure

Cited by 14 publications

References 4 publications

Composite Materials Strength Determination Within the Current Certification Methodology for Aircraft Structures

Composite Materials Strength Determination Within the Current Certification Methodology for Aircraft Structures

Axes for Sociotechnical Inquiry in AI Research

Investigation of Silica-Based Shear Thickening Fluid in Enhancing Composite Impact Resistance

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