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Experimental and Computational Investigation of the Progression of Damage in 3d Orthogonal Composites.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Experimental and Computational Investigation of the Progression of Damage in 3d Orthogonal Composites./
Author:	Sesar, Nathaniel Adam.
Description:	1 online resource (147 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
Contained By:	Dissertations Abstracts International85-05B.
Subject:	Load. -
Online resource:	click for full text (PQDT)
ISBN:	9798380711890

Experimental and Computational Investigation of the Progression of Damage in 3d Orthogonal Composites.
Sesar, Nathaniel Adam.

Experimental and Computational Investigation of the Progression of Damage in 3d Orthogonal Composites. - 1 online resource (147 pages)

Source: Dissertations Abstracts International, Volume: 85-05, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2023.

Includes bibliographical references

This dissertation is a study on the progressive damage in 3D orthogonal composites. The understanding of progressive damage within 3D orthogonal composites can lead to better part manufacturing and expanded uses for composites in the aerospace industry. This is important because current traditional composite materials used tend to have catastrophic failure mechanisms that are unable to be stopped after initiation. This leads to parts being thrown out even after little amounts of damage is present. This study uses two testing methods to analyze the damage mechanisms within 3D composites. To do this, 3D orthogonal fabrics provided by the Army Research Lab are infused with different resin types and tested using Overheight Compact Tension (OCT) and Compact Compression (CC) testing methods. These test methods allow for damage to be analyzed from a notch tip which allows for ease of damage analysis because all damage is isolated at the notch tip because of extreme stress concentration. Each specimen is also scanned using X-ray Computed Tomography to allow for internal looks at the damage mechanisms and their interactions with each other. An accurate recreation of the composite is created using Virtual Textile Morphology Suite (VTMS) to perform finite element simulations of. The virtual textile is then used to create a global local meso-scale model to analyze the damage internally in an attempt to recreate realistic damage mechanisms inside the finite element simulation.Three different material batches were tested, one using RTM6, SC15, and Hexcel 1078 resin systems. This was to provide another angle to see how the resin systems affected the progressive damage response. While each data set had different loading curve differences, with the RTM6 resin system performing best in terms of peak load and stiffness, the overall damage response was very similar between each resin system. The progressive damage highly depended on the location of the notch tip in reference to the warp tows and the binder tows. The binder tow locations dictated the crack response due to high density of resin around each binder tow. Due to the nature of a 3D orthogonal composite, there are resin pockets in between fiber tows and all of these are in line with binder locations. The damage in both OCT and CC specimens localized around these resin rich regions and binder locations. The finite element simulations also showed similar results. The resin rich regions dictated where the damage occurred. The qualitative damage response between the experiments and models matched well, but there was a large difference in the load response of the model. The damage response in 3D orthogonal composites are well analyzed from a notch tip using X-ray CT, FEM, and mechanical testing methods.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798380711890Subjects--Topical Terms:

1437809
Load.
Index Terms--Genre/Form:

554714
Electronic books.

Experimental and Computational Investigation of the Progression of Damage in 3d Orthogonal Composites.
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245 1 0 $a Experimental and Computational Investigation of the Progression of Damage in 3d Orthogonal Composites.
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500 $a Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
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502 $a Thesis (Ph.D.)--North Carolina State University, 2023.
504 $a Includes bibliographical references
520 $a This dissertation is a study on the progressive damage in 3D orthogonal composites. The understanding of progressive damage within 3D orthogonal composites can lead to better part manufacturing and expanded uses for composites in the aerospace industry. This is important because current traditional composite materials used tend to have catastrophic failure mechanisms that are unable to be stopped after initiation. This leads to parts being thrown out even after little amounts of damage is present. This study uses two testing methods to analyze the damage mechanisms within 3D composites. To do this, 3D orthogonal fabrics provided by the Army Research Lab are infused with different resin types and tested using Overheight Compact Tension (OCT) and Compact Compression (CC) testing methods. These test methods allow for damage to be analyzed from a notch tip which allows for ease of damage analysis because all damage is isolated at the notch tip because of extreme stress concentration. Each specimen is also scanned using X-ray Computed Tomography to allow for internal looks at the damage mechanisms and their interactions with each other. An accurate recreation of the composite is created using Virtual Textile Morphology Suite (VTMS) to perform finite element simulations of. The virtual textile is then used to create a global local meso-scale model to analyze the damage internally in an attempt to recreate realistic damage mechanisms inside the finite element simulation.Three different material batches were tested, one using RTM6, SC15, and Hexcel 1078 resin systems. This was to provide another angle to see how the resin systems affected the progressive damage response. While each data set had different loading curve differences, with the RTM6 resin system performing best in terms of peak load and stiffness, the overall damage response was very similar between each resin system. The progressive damage highly depended on the location of the notch tip in reference to the warp tows and the binder tows. The binder tow locations dictated the crack response due to high density of resin around each binder tow. Due to the nature of a 3D orthogonal composite, there are resin pockets in between fiber tows and all of these are in line with binder locations. The damage in both OCT and CC specimens localized around these resin rich regions and binder locations. The finite element simulations also showed similar results. The resin rich regions dictated where the damage occurred. The qualitative damage response between the experiments and models matched well, but there was a large difference in the load response of the model. The damage response in 3D orthogonal composites are well analyzed from a notch tip using X-ray CT, FEM, and mechanical testing methods.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
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650 4 $a Mechanical properties. $3 1004682
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