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<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Response of Seven Crystallographic Orientations of Sapphire Crystals to Shock Stresses of 16 to 86 GPa · HackerPapers discussions</title><link>https://hackerpaper.kaipfister.de/p/0908.2058/</link><description>Collected HN comments and submissions linking this paper.</description><language>en</language><lastBuildDate>Mon, 02 Nov 2026 11:16:22 GMT</lastBuildDate><atom:link href="https://hackerpaper.kaipfister.de/p/0908.2058/feed.xml" rel="self" type="application/rss+xml" /><item><title>Response of Seven Crystallographic Orientations of Sapphire Crystals to Shock Stresses of 16 to 86 GPa — mentioned by DannyBee</title><link>https://news.ycombinator.com/item?id=8296502</link><guid isPermaLink="false">urn:hackerpapers:mention:0908.2058:8296502</guid><pubDate>Wed, 10 Sep 2014 13:45:41 GMT</pubDate><description>&lt;p&gt;first, &amp;quot;strength&amp;quot; is not a thing. You need to be very specific what you are talking about. Scratch and crack resistance are very different things (one usually measured by taber, and the other by various other methods), and combining them is meaningless. So is &amp;quot;crack resistance&amp;quot;. Do you mean when someone tries to indent it? DO you mean when flexed in some other specific way? Do you specifically mean when dropped? Materials have very different properties depending on what you are asking. You can&amp;#x27;t just combine these very different things into some measure without some actual methodology for…&lt;/p&gt;&lt;p&gt;&lt;a href="https://hackerpaper.kaipfister.de/p/0908.2058/"&gt;Paper and discussion history&lt;/a&gt;. A mention is not an endorsement.&lt;/p&gt;</description><category>cond-mat.mtrl-sci</category></item></channel></rss>
