<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>22775</id>
    <completedYear/>
    <publishedYear>2018</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>12</pageNumber>
    <edition/>
    <issue>2</issue>
    <volume>11</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2018-11-26</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Layup Configuration Effect on Notch Residual Strength in Composite Laminates</title>
    <abstract language="eng">The current trend shows an increasing demand for composites due to their high stiffness to weight ratio and the recent progress in manufacturing and cost reduction of composites. To combine high strength and stiffness in a cost-effective way, composites are often joined with steel or aluminum. However, joining of thermoset composite materials is challenging because circular holes are often used to join them with their metal counterparts. These design based circular holes induce high stress concentration around the hole. The purpose of this paper is to focus on layup configuration and its impact on notch stress distribution. To ensure high quality and uniformity, the holes were machined by a 5 kW continuous wave (cw) CO2 laser. The stress distribution was evaluated and compared by using finite element analysis and Lekhnitskii’s equations. For further understanding, the notch strength of the laminates was compared and strain distributions were analyzed using the digital image correlation technique.</abstract>
    <parentTitle language="eng">Materials</parentTitle>
    <identifier type="doi">10.3390/ma11020308</identifier>
    <identifier type="issn">1996-1944</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Artikelnummer">308</enrichment>
    <author>
      <firstName>Venkateswaran</firstName>
      <lastName>Santhanakrishnan Balakrishnan</lastName>
    </author>
    <submitter>
      <firstName>Yannic</firstName>
      <lastName>Adler</lastName>
    </submitter>
    <author>
      <firstName>Holger</firstName>
      <lastName>Seidlitz</lastName>
    </author>
    <author>
      <firstName>Sabine</firstName>
      <lastName>Weiß</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>composite</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>notch stress</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>digital image correlation</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>ekhnitskii’s equation</value>
    </subject>
    <collection role="institutes" number="3406">FG Metallkunde und Werkstofftechnik</collection>
    <collection role="institutes" number="3422">FG Polymerbasierter Leichtbau</collection>
  </doc>
  <doc>
    <id>24089</id>
    <completedYear/>
    <publishedYear>2019</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>173</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2019-05-25</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Influence of metal surface preparation on the flexural strength and impact damage behaviour of thermoplastic FRP reinforced metal laminate made by press forming</title>
    <abstract language="eng">In this paper the relationship between surface energy and flexural strength of metal laminate made by reinforcing glass fibre reinforced polymer on steel surfaces was investigated. Sand blasting was performed on 22MnB5 steel surface. This steel was stacked together with layers of unidirectional glass/polyamide-6 prepreg, followed by pressing in a hot press. Influenced parameters are pressure, temperature and time. 3D profilometer analysis was used to investigate the roughness profile on the surface of the steel generated by the sand blasting. The surface energy of the steel surface was calculated from a set of contact angles measured by three different liquids. To identify the optimal surface treatment, the variation of surface energy, flexural strength and roughness of the steel surface was determined as function of the surface treatment. Surface roughness (Ra of 1.08 μm), results indicate that increasing surface roughness leads to improvement in flexural modulus. The increase further leads to decrease in flexural modulus. In addition, the influence of surface energy and flexural strength on the impact damage behaviour was investigated too. The results showed that the sample with highest flexural modulus had the lowest impact-induced damage area.</abstract>
    <parentTitle language="eng">Composites Part B: Engineering</parentTitle>
    <identifier type="doi">10.1016/j.compositesb.2019.05.094</identifier>
    <identifier type="url">https://www.sciencedirect.com/science/article/pii/S135983681930318X</identifier>
    <identifier type="issn">1359-8368</identifier>
    <enrichment key="BTU">an der BTU erstellt / created at BTU</enrichment>
    <enrichment key="Artikelnummer">106883</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">false</enrichment>
    <author>
      <firstName>Venkateswaran</firstName>
      <lastName>Santhanakrishnan Balakrishnan</lastName>
    </author>
    <submitter>
      <firstName>Aleksei</firstName>
      <lastName>Obrosov</lastName>
    </submitter>
    <author>
      <firstName>Aleksei</firstName>
      <lastName>Obrosov</lastName>
    </author>
    <author>
      <firstName>Felix</firstName>
      <lastName>Kuke</lastName>
    </author>
    <author>
      <firstName>Holger</firstName>
      <lastName>Seidlitz</lastName>
    </author>
    <author>
      <firstName>Sabine</firstName>
      <lastName>Weiß</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Fiber reinforced plastic (FRP)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>FRP reinforced metal composite</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Sand blasting surface treatment</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Surface energy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Contact angle</value>
    </subject>
    <collection role="institutes" number="3406">FG Metallkunde und Werkstofftechnik</collection>
    <collection role="institutes" number="3422">FG Polymerbasierter Leichtbau</collection>
  </doc>
</export-example>
