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<table border="0" cellpadding="10" cellspacing="0" width="100%"><tr><td align="center" valign="middle"><tr><td>NDT.net Issue: <a href="/search/docs.php3?issue=1&amp;date=2025-11-01&amp;showForm=" title="more of this">2025-11</a><br/><a href="/search/docs.php3?MainSource=373" title="more of this">Selected Papers from the DGZfP Annual Conference 2025 (ReJNDT )</a><br/><font size="-1"><font color="#aaaaaa"> Special Issue of Research and Review Journal of Nondestructive Testing  (ReJNDT) ISSN 2941-4989 | <a href="/search/docs.php3?showForm=off&amp;MainSource=373&amp;PubVol=&amp;PubNo=" title="more of this"></a></font></font> <tr><td><tr><td><hr/><h1 class="title">Material Characterization of Fiber-Reinforced Composites Using AirCoupled Ultrasonic Polar Scans</h1>Julian Würthner<a href="#" onclick="alert('julian.wuerthner@ikt.uni-stuttgart.de (may not be valid)'); return false;"><img border="0" hspace="2" src="..//pic/mail.gif" width="16"/></a><a href="/search/docs.php3?AuthorID=52057&amp;showForm=off" target="_parent" title="2 more articles"><img border="0" hspace="2" src="/pic/html2.svg" width="14"/><sup><font class="ssmall">2</font></sup></a>, Marc Kreutzbruck<a href="#" onclick="alert('marc.kreutzbruck@ikt.uni-stuttgart.de (may not be valid)'); return false;"><img border="0" hspace="2" src="..//pic/mail.gif" width="16"/></a><a href="/search/docs.php3?AuthorID=9557&amp;showForm=off" target="_parent" title="187 more articles"><img border="0" hspace="2" src="/pic/html2.svg" width="14"/><sup><font class="ssmall">187</font></sup></a><span style="line-height:1.2;font-size:12px;"><br/>University of Stuttgart<a href="/search/docs.php3?instID=1068&amp;showForm=off" target="_parent" title="377 more articles"><img border="0" hspace="2" src="/pic/html2.svg" width="14"/><sup><font class="ssmall">377</font></sup></a>, Stuttgart , Germany</span><p><div style="line-height:1.4;'"><b>Abstract:</b> The widespread use of fiber-reinforced composites is partly due to their high weight-specific mechanical properties. Due to their complex structure, however, there are high demands on quality assurance. One testing method is the ultrasonic polar scan, which is based on the interaction between the properties of ultrasonic waves and the material. The aim of the method is to characterize the anisotropic propagation behaviour of acoustic waves, which in turn provides information about the anisotropic stiffness. The ultrasonic polar scan consists of multiple measurements in which the angles are varied according to a polar coordinate system around one point. 
Measurements using ultrasound are carried out in transmission and are compared and verified using a calculation model. Three test specimens were examined for this purpose, two glass fiber reinforced anisotropic test specimens and one isotropic specimen. The results show that conclusions can be made about the anisotropy based on the amplitude of the transmitted signal. There is a fundamental agreement between the measurement results of this work and the results of the literature, which were carried out in a water immersed system. 
However, due to the deviating excitation signal, a harmonic signal can always be assumed, which means that Lamb waves are primarily responsible for the acoustic transmission behaviour. In contrast, classic airborne ultrasonic tests with a periodic excitation signal of approx. 5-7 cycles are in a transitional range between pulsed and harmonic, which made it difficult to interpret the results of the present work.</div><br/><p><b>Keywords: </b> <a href="/search/docs.php3?KeywordID=6676">material characterization</a> (27), <a href="/search/docs.php3?KeywordID=7708">Non-Destructive Testing (NDT)</a> (942), <a href="/search/docs.php3?KeywordID=8110">fiber reinforced plastic</a> (3), <a href="/search/docs.php3?KeywordID=10020">Ultrasonic polar scan</a> (3)<br/>*<font class="small"><i>Keywords are freely formed keywords from the authors and thus you may <a href="docs.php3">Search</a> also for similar terms.</i></font><a name="file"></a><br/><br/><b>View:</b> <a href="/article/rejndt/3_2/papers/1406_manuscript.pdf" onclick="ga('send','event','archive','click',' docID=31930 | ReJNDT  | source=docs | link=article/rejndt/3_2/papers/1406_manuscript.pdf')" target="_blank"><img border="0" src="/pic/PDF.svg" title="1.2MB | id=31930 " width="30"/> </a> <hr/><a href="/forum/post.php?forenID=0&amp;post=1&amp;DocID=31930&amp;DocGroup=1&amp;docTitle=Material Characterization of Fiber-Reinforced Composites Using AirCoupled Ultrasonic Polar Scans" target="_parent" title="Comments or Questions?"><span style="padding-left: 2px;cursor: hand;color:#ffffff;background-color:#477189;font-size:13px; margin: 3px; padding: 3px;border-radius:4px"><img border="0" src="/pic/forum.png"/>Comments or Questions?</span></a><br/><br/><b>Share:</b><dd>
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</dd><b>Cite</b>:<dd>Würthner, J., &amp; Kreutzbruck, M. (2025). Material Characterization of Fiber-Reinforced Composites Using AirCoupled Ultrasonic Polar Scans. Selected Papers from the DGZfP Annual Conference 2025. <i>Research and Review Journal of Nondestructive Testing</i> . https://doi.org/10.58286/31930</dd><b>Copyright</b>:<dd>©2025 The Authors under License CC-BY-4.0</dd><p><b>Published:</b> 1 Nov 2025 </p><tr><td><table><tr><td colspan="2" style="border-top:1px #aaaaaa solid; border-bottom: 1px solid #eeeeee; background-color:#f8f8f8;" valign="top">More from "<b>Julian Würthner</b>" (1)<tr><td nowrap="" valign="top">2025-08 <td valign="top"><a href="/search/docs.php3?id=31465">Untersuchung zur Realisierung von luftgekoppelten Ultraschall-Polar-Scans</a> </td></td></tr></td><tr><td><br/><tr><td colspan="2" valign="top"><b>Co-Authored mostly with: </b><span style="white-space: nowrap;"><a href="/search/docs.php3?AuthorID=52057&amp;restrict=authors&amp;searchmode=Phrase&amp;SearchDocs=Kreutzbruck" title=" Marc Kreutzbruck "><img border="0" hspace="2" src="/pic/html2.svg" width="14"/>M. 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