Mechanics of Deformable Bodies Chapter 2 Axial Strain Problem 3 (PH)

[@ishahipolito7306]

thanku po

[@quimnoprince1807]

thank you sa pag explain po sir, mas naintindihan ko explanation nyo kesa sa book ko

[@cebox]

You’re very welcome po! God bless po! (And nawa, pashare na rin po ng aming channel sa friends, classmates ninyo na nagsstruggle din ng pagaaral sa Civil Engineering. Thank you po! 🥹)

[@dubidubi3088]

ano po reason bakit need mag elongate nung cable ac na original?

[@cebox]

Mechanics of "Deformable" Bodies na po tayo, wala na po tayo sa "Rigid" Bodies. Kaya ang mga materials po rito is inaaral natin ang kanilang strength in terms of their deformations kaya madedeform po talaga mga materials sa mga discussion natin. Elongation is deformation.

[@ongjudeangeloa.4286]

Good eve sir, bakit po pababa ung deformation kung mataas naman po yung vertical force nc AC which is 3111 ?

[@cebox]

Take note, that 3111.48 lb is inclined, not vertical force. Yung 2000 lb is vertical force. (𝗦𝗼𝗿𝗿𝘆 𝗳𝗼𝗿 𝘁𝗵𝗲 𝘃𝗲𝗿𝘆 𝗹𝗮𝘁𝗲 𝗿𝗲𝗽𝗹𝘆. 𝗪𝗲'𝗿𝗲 𝗷𝘂𝘀𝘁 𝗯𝘂𝘀𝘆 𝘁𝗵𝗲𝘀𝗲 𝗽𝗮𝘀𝘁 𝗳𝗲𝘄 𝗺𝗼𝗻𝘁𝗵𝘀 𝗶𝗻 𝗼𝘂𝗿 𝗽𝘂𝗯𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝘀𝗮 𝗠𝗮𝘀𝘁𝗲𝗿𝗮𝗹, 𝘀𝗮 𝗧𝗵𝗲𝘀𝗶𝘀, 𝘄𝗼𝗿𝗸 𝘀𝘁𝘂𝗳𝗳, 𝗮𝗻𝗱 𝗹𝗶𝗳𝗲. 𝗛𝗼𝗽𝗲 𝗻𝗮 𝗻𝗮𝗸𝗮𝘁𝘂𝗹𝗼𝗻𝗴 𝗮𝗻𝗴 𝗖𝗘 𝗕𝗼𝘅 𝘀𝗮 𝗶𝗻𝘆𝗼𝗻𝗴 𝗽𝗮𝗴𝗮𝗮𝗿𝗮𝗹. 𝗧𝗵𝗮𝗻𝗸 𝘆𝗼𝘂 𝗮𝗻𝗱 𝗚𝗼𝗱 𝗯𝗹𝗲𝘀𝘀!)

[@cebox]

That force of AC is the internal force to resist 2000 lb, not necessarily that force will pull the 2000 lb pataas. Hindi ganun po nagwowork yun. Imagine, ikaw po yung 2000 lb, then may cable, does that cable will brought you upward? No, right? Then what will be the displacement? Downward due to your weight 2000 lb at that point. (𝗦𝗼𝗿𝗿𝘆 𝗳𝗼𝗿 𝘁𝗵𝗲 𝘃𝗲𝗿𝘆 𝗹𝗮𝘁𝗲 𝗿𝗲𝗽𝗹𝘆. 𝗪𝗲'𝗿𝗲 𝗷𝘂𝘀𝘁 𝗯𝘂𝘀𝘆 𝘁𝗵𝗲𝘀𝗲 𝗽𝗮𝘀𝘁 𝗳𝗲𝘄 𝗺𝗼𝗻𝘁𝗵𝘀 𝗶𝗻 𝗼𝘂𝗿 𝗽𝘂𝗯𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝘀𝗮 𝗠𝗮𝘀𝘁𝗲𝗿𝗮𝗹, 𝘀𝗮 𝗧𝗵𝗲𝘀𝗶𝘀, 𝘄𝗼𝗿𝗸 𝘀𝘁𝘂𝗳𝗳, 𝗮𝗻𝗱 𝗹𝗶𝗳𝗲. 𝗛𝗼𝗽𝗲 𝗻𝗮 𝗻𝗮𝗸𝗮𝘁𝘂𝗹𝗼𝗻𝗴 𝗮𝗻𝗴 𝗖𝗘 𝗕𝗼𝘅 𝘀𝗮 𝗶𝗻𝘆𝗼𝗻𝗴 𝗽𝗮𝗴𝗮𝗮𝗿𝗮𝗹. 𝗧𝗵𝗮𝗻𝗸 𝘆𝗼𝘂 𝗮𝗻𝗱 𝗚𝗼𝗱 𝗯𝗹𝗲𝘀𝘀!)

[@eglaff492]

sir paano po kapag malaki ang deformation? mag-aassume pa rin ba na perpendicular yung angle sa point C?

[@cebox]

Hi. Ahm kapag deformation po, maliit lang po talaga yun. As you can see, 0.00 something lang ang mga deformation, kasi dapat talaga maliit lang yun at hindi pwedeng lumaki, kapag lumaki yun, wala na, wasak na ang structure, so I think you don't need to worry about malaking deformaton kasi hindi yun pinapahintulutan sa code, so we can assume it perpendicular. :)

[@MSTRquintin]

sir okay lang po di ba na yung 8 feet convert ko na agad into inches? malaki2 yung value ko sir if ganun po compared po sa inyo

[@cebox]

Hmmm baka 8ft lang ang cinonvert mo? If cinonvert mo ang 8 ft into inches, dapat puro inches din yung ibang variables and constant. (Sorry po for the very late responce, abala lang po sa work, masteral, and life.)

[@cadisetramadiraizel9223]

Sir pano pag hindi given yong E or strain?

[@cebox]

Constant po kasi ang E sa different type of materials. Usually, binibigay iyon kasi hindi naman pwedeng memorize ng bata lahat ng E. Sa Steel, 200 GPa. And sa strain naman, that is equivalent to E/σ. (Sorry for the very, very late reply as CE Box is very busy with his Master's Degree, Accreditation, Work Stuff, and Life. Thank you for understanding. Keep in touch with CE Box as we plan to do more video tutorials.)

[@g.9814]

sir, bakit po yung modulus of elasticity po yung kinuha sa deformation ng AC?

[@cebox]

Hi. Hindi ko po gets tanong ninyo? Kasi hindi naman po natin kinuha yung Modulus of Elasticity e? Yung deformation delta ang kinuha natin...

[@g.9814]

@@cebox i mean yung ginamit po sir, naguguluhan po kasi ako yung delta AC po yung kinukuha pero yung Elasticity po nung steel yung ginamit.

[@cebox]

Ah yes. Hindi ba tama? Modulus of elasticity ng Cable AC, ang cable yun yung steel cable AC. So modulus ng elasticity ng steel gagamitin.

[@g.9814]

@@cebox oooooohh sorry po sir medyo nalito po HAHAHHA(iniisip ko pong steel yung bar hahahhaha). thank you po!

[@cebox]

Ah ayun. Hehehehe sige! :)

[@isitorres8281]

sir paano mo po nalaman na pababa yung BC

[@cebox]

Hmmm kasi may loading tayo at point C na downward, kaya hihilahin lang ng force yung C pababa... (Sorry for the very, very late reply as CE Box is very busy with his Master's Degree, Accreditation, Work Stuff, and Life. Thank you for understanding. Keep in touch with CE Box as we plan to do more video tutorials.)