Patch Repair Analysis of Impact Damaged Glass Fiber / Epoxy Composite Tubes Operating Under Internal Pressure

İbrahim Fadıl Soykök

Article Details

Patch Repair Analysis of Impact Damaged Glass Fiber / Epoxy Composite Tubes Operating Under Internal Pressure

Authors:

İbrahim Fadıl Soykök

Publisher:

Dokuz Eylul University

Main Topics:

Mühendislik

Journal:

Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi Vol.25 Issue 73, pp.107-120

Document Type:

Article

Publication Date:

1/2023

Document Language:

English

Document ID (Org No.):

2001281966

pISSN:

1302-9304

Keywords:

Abstract:

 Application of composite patches is a useful technique to repair damaged structures such as wind turbines, air vehicles, pressure tanks because of lightweight, flexible design, and low price, and have found a widespread application area in many more industries. To avoid excessive weight of the repaired region as well as unnecessary material consumption composite patches need to be optimized according to shape, size and material specifications. This paper introduces a numerical assessment of size and material effect in composite-to-composite patches having specific shape and material properties. Adhesively bonded round-tipped composite patch pieces are utilized to repair a quadrilateral puncture damaged cylindrical thin-walled hollow composite tubes loaded by internal pressure. Glass fiber  epoxy patches with five different kinds of stacking sequence and ten different sizes are numerically investigated to achieve the best composite patch solutions. Although the safety factor of repaired tubes enhances by increasing tip radiuses and hence their sticking area, it is found to be not sufficient to ensure that the patching process is completely safe because of the fiber orientation playing an important role on the factor of safety. The patches having 04, 0, -45,45,90, and 0 ,90 2 stacking sequences and having adequate patch areas are found to be able to provide the safety value of 1.15 which is defined for normal safety class and below 5 coefficients of variation COV value in DNVs Offshore Standard DNV-OS-C501.

 Application of composite patches is a useful technique to repair damaged structures such as wind turbines, air vehicles, pressure tanks because of lightweight, flexible design, and low price, and have found a widespread application area in many more industries. To avoid excessive weight of the repaired region as well as unnecessary material consumption composite patches need to be optimized according to shape, size and material specifications. This paper introduces a numerical assessment of size and material effect in composite-to-composite patches having specific shape and material properties. Adhesively bonded round-tipped composite patch pieces are utilized to repair a quadrilateral puncture damaged cylindrical thin-walled hollow composite tubes loaded by internal pressure. Glass fiber  epoxy patches with five different kinds of stacking sequence and ten different sizes are numerically investigated to achieve the best composite patch solutions. Although the safety factor of repaired tubes enhances by increasing tip radiuses and hence their sticking area, it is found to be not sufficient to ensure that the patching process is completely safe because of the fiber orientation playing an important role on the factor of safety. The patches having 04, 0, -45,45,90, and 0 ,90 2 stacking sequences and having adequate patch areas are found to be able to provide the safety value of 1.15 which is defined for normal safety class and below 5 coefficients of variation COV value in DNVs Offshore Standard DNV-OS-C501.

 Application of composite patches is a useful technique to repair damaged structures such as wind turbines, air vehicles, pressure tanks because of lightweight, flexible design, and low price, and have found a widespread application area in many more industries. To avoid excessive weight of the repaired region as well as unnecessary material consumption composite patches need to be optimized according to shape, size and material specifications. This paper introduces a numerical assessment of size and material effect in composite-to-composite patches having specific shape and material properties. Adhesively bonded round-tipped composite patch pieces are utilized to repair a quadrilateral puncture damaged cylindrical thin-walled hollow composite tubes loaded by internal pressure. Glass fiber  epoxy patches with five different kinds of stacking sequence and ten different sizes are numerically investigated to achieve the best composite patch solutions. Although the safety factor of repaired tubes enhances by increasing tip radiuses and hence their sticking area, it is found to be not sufficient to ensure that the patching process is completely safe because of the fiber orientation playing an important role on the factor of safety. The patches having 04, 0, -45,45,90, and 0 ,90 2 stacking sequences and having adequate patch areas are found to be able to provide the safety value of 1.15 which is defined for normal safety class and below 5 coefficients of variation COV value in DNVs Offshore Standard DNV-OS-C501.

 Kompozit yama uygulaması, hafifliği, esnek tasarımı ve düşük fiyatı nedeniyle rüzgâr türbinleri, hava araçları, basınçlı tanklar gibi hasarlı yapıları onarmak için faydalı bir teknik olup daha birçok endüstride yaygın bir uygulama alanı bulmuştur. Onarılan bölgenin aşırı ağırlığından ve gereksiz malzeme tüketiminden kaçınmak için kompozit yamaların şekil, boyut ve malzeme özelliklerine göre optimize edilmesi gerekir. Bu makale, belirli şekil ve malzeme özelliklerine sahip kompozitten kompozite yamalarda boyut ve malzeme etkisinin sayısal bir değerlendirmesini sunmaktadır. Yapıştırılarak uygulanmış yuvarlak uçlu kompozit yama parçaları, iç basınçla yüklenen dörtgen şeklinde delinme hasarlı silindirik ince duvarlı içi boş kompozit tüpleri onarmak için kullanılmaktadır. Beş farklı istifleme dizisine ve on farklı boyuta sahip cam elyaf  epoksi yamalar, en iyi kompozit yama çözümlerini elde etmek için sayısal olarak incelenmiştir. Onarılan tüplerin güvenlik faktörü, uç yarıçaplarını ve dolayısıyla yapışma alanlarını artırarak yükselse de güvenlik faktörü üzerinde önemli bir rol oynayan fiber oryantasyonu nedeniyle yama işleminin tam güvenli olmasını sağlamak adına yeterli olmadığı bulunmuştur. 04, 0, -45,45,90 ve 0 ,90 2 istifleme dizisine sahip ve yeterli yama alanlarına sahip olan yamaların DNVnin Offshore Standardında DNV-OS-C501 normal güvenlik sınıfı ve 5in altındaki varyasyon katsayısı COV değeri için tanımlanan 1.15 değeri için güvenlik katsayısını sağlayabildiği bulunmuştur.

Article Details

Patch Repair Analysis of Impact Damaged Glass Fiber / Epoxy Composite Tubes Operating Under Internal Pressure

Authors:

İbrahim Fadıl Soykök

Publisher:

Dokuz Eylul University

Main Topics:

Mühendislik

Journal:

Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi Vol.25 Issue 73, pp.107-120

Document Type:

Article

Publication Date:

1/2023

Document Language:

English

Document ID (Org No.):

2001281966

pISSN:

1302-9304

Patch repair

Glass-fiber epoxy

Composite tubes

Pressure load

Yama tamiri

Cam elyaf epoksi

Kompozit borular

Basınç yükü

Issues

Article Details

Authors: İbrahim Fadıl Soykök

Publisher: Dokuz Eylul University

Main Topics: Mühendislik

Journal: Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi Vol.25 Issue 73, pp.107-120

Document Type: Article

Publication Date: 1/2023

Document Language: English

Document ID (Org No.): 2001281966

pISSN: 1302-9304

Issues

Authors:

İbrahim Fadıl Soykök

Publisher:

Dokuz Eylul University

Main Topics:

Mühendislik

Journal:

Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi Vol.25 Issue 73, pp.107-120

Document Type:

Article

Publication Date:

1/2023

Document Language:

English

Document ID (Org No.):

2001281966

pISSN:

1302-9304