how many /diy/ers can solve this question? the answer might surprise you!
This is where the axis breaks.
D) Neither, because the post and arm are made of steel tube painted to look like wood, and the black sphere and chain is made of polyethylene and from picrel
>>2810836yeah but the beams are covered in burning jet fuel
>>2810816a
They say that wood performs better in compression than in tension, and I believe that's true. If we assume that the joint between beam and post is unbreakable, and that the wooden beam is uniform and unbreakable *except* for those two points, then the point that's in tension (A) will break first. "First", but just barely. The failure of A will almost immediately lead to the failure of B.But I'm a B-fag when it really comes down to it.>muh hula hoopsPlease.
lol at people overthinking this. it's a.
c) it snaps like spaghetti into 3 pieces
>>2810816at the knot
>>2810816>be me>get engineering degree>apply at company>give me mechanical aptitude test>hear nothing>put on my super charm and call secretary to pump for info>"so have you heard anything?">"well you scored higher on the mechanical aptitude test than anyone who has ever taken it so I can't imagine they wouldn't want you.">feels good man>they never calledknowing is the true failure. also the answer is D. it won't break if it's not already broken in this scenario. nothing is changing so it is a static system shown.
>>2810965>well you scored higher on the mechanical aptitude test than anyone who has ever taken it so I can't imagine they wouldn't want youthat was sarcasm, anon. they were probably laughing together about your test result when you called.
>>2810864But that won't melt it
>>2810980:o
>>2810816>do my homework for me!The real life answer is this >>2810948, but assuming the material is homogenous then it is most likely to break at A. Since the top of the material is in tension while the bottom is in compression.
>>2810894>They say that wood performs better in compression than in tensionthe tensile strength of a wood beam along the axis of the fibres is much higher in tension than in compressionhowever compression doesn't lead to cracks
>>2811985I mean it took like 70 years to figure out why the baseball bat breaks backwards so maybe don't get too wrapped up in the details before we even know what type of wood we're talking about.
>>2810816wood is anisotropic but like other anons have said it usually performs better in tension, so Bthere are also shear forces in the axial and normal direction but i don't think that matters much here
did you know that trees naturally grow compressionwood and tensionwood, old woodcrafters used to exploit these properties to get the most out of their timber, a detail lost on modern carpentry
>>2812214in fact they now actively avoid sawn timber with reactionwood because it doesn't comply easily
>>2812214was used in bowmaking as well
>>2810836>D) NeitherThat would be answer C.
>>2810965>mechanical aptitude testThey don't have hard questions like "is a bicycle's right pedal left threaded?" Instead they're testing if you remember getting splashed while washing cutlery.
>>2810980But it might make it deform instead of cracking
>>2813943Yeah, but that doesn't explain why the one next to it cracked too.
>>2810816There's nothing to discuss. Typical construction timber has properties of C24. It's in german but tension strength of 14 N/mm2 is a lot lower then compression strength of 21 N/mm2.The part of cross section in your example is the top part, the solution is A. Here is video of a four point bending test https://youtu.be/ws7eJPYda2s
>>2810965You was white, cracka.
>>2816232>Here is video of a four point bending testliterally the opposite situation op asked for
>>2816573No it's not, it's bending in both cases.
>>2810980doesnt have to melt to be structurally useless
>>2810836>black sphereclose, but that's jigglypuff viewed from above (painted black)
