<p>I want to tackle an experiment with the following goal:</p>

<blockquote>
  <p>Determine the correlations between printing parameters (temperatures,
  speeds, humidity, perimeters, infill, etc.) and tensile strength using
  a specific 3D printer, test specimen, and filament brand/model.</p>
</blockquote>

<p>This goal calls for two parts then: a standardized <strong>test procedure</strong> and <strong>test specimen</strong>. For the test procedure, I've been asking myself:</p>

<blockquote>
  <p>What portable, measurable and roughly consistent tensile strength test
  does not require building a complicated machine, can be performed with
  ready-made tools or machines available at a large hardware store, and
  can be set up within 5 minutes?</p>
</blockquote>

<p>I am thinking here about a procedure that lies somewhere between this <a href="https://youtu.be/CZX8eHC7fws?t=136" rel="noreferrer">hanging scale test</a> and ISO 527. Definitely not using <a href="https://youtu.be/R7gpW6aCz0o?t=116" rel="noreferrer">bare hands</a> or <a href="https://youtu.be/bmgSojocJ3c?t=388" rel="noreferrer">pliers</a>. Once the procedure is defined, this begs the question:</p>

<blockquote>
  <p>Is the ISO 3167 multipurpose test specimen an appropriate specimen for
  the test procedure outlined above or are there other specimens that
  are more suitable?</p>
</blockquote>

<p>I was thinking that, since the usual filaments have an ultimate strength of around <a href="https://www.simplify3d.com/support/materials-guide/properties-table/" rel="noreferrer">40-60 MPa</a>, perhaps the "recoil" would be too much and one needs to use a smaller, weaker specimen.</p>

[{'answer_id': 6610, 'author': '0scar', 'author_id': 5740, 'author_profile': 'https://3dprinting.stackexchange.com/users/5740', 'pm_score': 3, 'selected': False, 'text': '<p>For these kind of tests you could rely on the <a href="https://www.astm.org/" rel="nofollow noreferrer">ASTM</a> standards. They define test procedures and test specimen sizes for different types of tests. Or you can derive a specimen yourself based on these standards (e.g. for my bachelor\'s degree I used an alternative notch impact specimen as I was bound to the amount of available material of the turbine rotor blade the specimens were taken from). Considering the material, you could device up a contraption made from extrusion profiles or something.</p>\n\n<p>Please do note that to get reasonable results, you would have to do a lot of tests as the spread in results is probably even more than in metals. </p>\n\n<p>The company I work for does this, these material qualification programmes run for long times (years, as we also do fatigue and creep testing), and a lot of samples are tested to qualify for use in Aerospace applications.</p>\n'}, {'answer_id': 14973, 'author': 'FarO', 'author_id': 2338, 'author_profile': 'https://3dprinting.stackexchange.com/users/2338', 'pm_score': 0, 'selected': False, 'text': '<p>A reliable and repeatable test can be performed by printing cylinders, tapping them to M4 thread and then testing the resulting bolts.</p>\n<p>My Tech Fun <div class="youtube-embed"><div>\r\n                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/ZiQek0wei1g?start=0"></iframe>\r\n            </div></div> does something like that, but he prints the thread directly, which may be less repeatable.</p>\n<p>Then you can perform pull and bend tests on the samples using simple attachments available at the hardware store.</p>\n'}]
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