What is Tensile Test, Strain-Stress Curve, Yield/Ultimate Strength, Toughness? 什麼是拉伸試驗、應力應變曲線圖、強度、韌性

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The low design factor is why aerospace parts and materials require stringent quality control and strict preventative maintenance schedules, so reliability can be ensured.
Reference:
www.instron.co...
www.cessnaflye...
www.matweb.com/...
screenrant.com...
www.marveldirec...

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Please beware of one mistake in the video
0:49 the green color arrows represent "internal forces", instead of pressure.
Usually, in engineering, F represents external forces while P represents internal forces.