theorectical tensile area of botls under stress
theorectical tensile area of botls under stress
(OP)
hello, i am doing this project on the tensile area of bolts under stress and I wonder if anyone knows the reason for the often quoted formula ( average of pitch diameters etc) which was found by experiments done by E M slaughter in the 1930s..
it seems everyone quotes this relationship in finding the theorectical tensile area without saying why is it so..
does anyone know about this topic ( or good online refereces on this issue)
thanks
stanton_tan@hotmail.com
it seems everyone quotes this relationship in finding the theorectical tensile area without saying why is it so..
does anyone know about this topic ( or good online refereces on this issue)
thanks
stanton_tan@hotmail.com





RE: theorectical tensile area of botls under stress
ISO 898-1
ISO 898-2
ISO 965-1
SAE 770420
VDI 2230
These are not available online for free, although you can obtain them from their publishers:
http://www.iso.ch
http://www.sae.org
http://www2.beuth.de/index_en.php3
Another source is FED-STD-H28/2B, available for free at:
http://astimage.daps.dla.mil/docimages/0001/34/77/H28-2B.PD9
(Thanks Kenneth for posting this numerous times in the past)
RE: theorectical tensile area of botls under stress
RE: theorectical tensile area of botls under stress
Actually, what I saw in Machinery Handbook (a 20 year old edition) was a cross-sectional area that included the area of the thread that you would slice through if you started at the minor diameter and made a right angled cross-sectional cut. Seemed to be a nice little bit of attention to detail...
However I have pulled some 3/4-10 (B7 and B16) fastners to failure, in tensile tests and that thread is always "dangling" around like a hangnail. I think that, for a little bit of conservatism, you might consider using the actual minor diameter for tensile stress calculations.