Tensile Strength

**FlyCanadianGuy** · 11-03-2006, 05:19 AM

Well, what dont you understand? If you machine your OWN bolts then you would use X thread with Y steel... and it would be in the book. You going to create metal from scratch? If so, I hope you are well educated in cooling metals and arranging molecules in the metal. If so, i doubt u need to ask questions on this thread.

**wil_wil2** · 11-03-2006, 11:13 AM

when you machine something, the tensile and shear will change from it original properties.

**Pineapple** · 11-03-2006, 01:54 PM

No, it doesn't. Unless you didn't use coolant and heat up the material too much.

Also please stop giving technical info because you've proven you don't have any.

**wil_wil2** · 11-03-2006, 03:50 PM

are you talking to me or FlyCanadianGuy?
Pineapple correct me if I am wrong but wont tensile strength will change on a bolt, depending on its thread depth, width, rotation, ratio, ect.
and please let pineapple respond first, since he is an engineer and you aren't

**Pineapple** · 11-03-2006, 04:07 PM

I'm talking to you wil wil2.

Tensile strength will not change unless material is heat treated. A d2" bar will have same tensile strength as a d0.2" bar.

How do you know FlyCanadianGuy is not an engineer?

I really hope you're not.

**wil_wil2** · 11-03-2006, 06:47 PM

So two 3/8" bolts made out of 4140, one fine thread and one coarse will have the same tensil? Or one 3/8" and one 5/8" would have the same?

And I am not questioning you knowledge, I am asking to make sure I understand you correctly.

**FlyCanadianGuy** · 11-03-2006, 09:41 PM

Actually Pineapple is a Mechanical engineer and I went to school for it (didnt finish... but thats another story for another time)

**Pineapple** · 11-04-2006, 04:45 PM

Quote:

Originally Posted by wil_wil2

So two 3/8" bolts made out of 4140, one fine thread and one coarse will have the same tensil? Or one 3/8" and one 5/8" would have the same?

And I am not questioning you knowledge, I am asking to make sure I understand you correctly.

As long as its same material, tensile strength is the same no matter what size or shape it is.
You're missing something in your education. Go read the book again.

**wil_wil2** · 11-04-2006, 07:48 PM

obviously I am missing something in my education, because I thought the yeild tensile strength changed with the parameter of the metal, and the ultimate tensile stayed the same.
What is it called when you are testing a bolts twisting strength?(I hope that made sense)

**Pineapple** · 11-05-2006, 12:33 AM

All the strength stay the same for same material, as long as they went through same heat treating.

Twisting is torsional strength which got nothing to do with your bolts breaking. It can be concider as both shear and tensile stress.

**wil_wil2** · 11-05-2006, 03:07 PM

does the torsional strength change depending on the objects parameter?

**FlyCanadianGuy** · 11-05-2006, 07:46 PM

Quote:

Originally Posted by wil_wil2

does the torsional strength change depending on the objects parameter?

No idea, skipped that class.

**Pineapple** · 11-05-2006, 08:40 PM

All strength are calculated base on yield strength. Go pick up your book and look at those formula. All strength are base on material never base on shape. No matter how many time you ask the same question the answer will stay the same.

**klue** · 12-27-2006, 11:20 PM

i think i understand the confusion.

the idea is that the materials which are the same have the same strength as a mesurable value. but when you change the ( lets use size) the strenght of the OBJECT changes not the material.

so basically, u need bigger bolts of the same material u are using now.
or u need the same size but a stronger MATERIAL.

help any?!?

**Pineapple** · 03-06-2007, 06:39 PM

Found this:
ROCKCRAWLER.com - Grade 5 vs. Grade 8 Fasteners
Someone did the math and I don't have to.

11-03-2006, 05:19 AM	#21 (permalink)
FlyCanadianGuy Location: Stouffville Posts: 585 Join Date: Oct 2003 Last On: 08-26-2008 07:45 PM	Re: Tensile Strength Well, what dont you understand? If you machine your OWN bolts then you would use X thread with Y steel... and it would be in the book. You going to create metal from scratch? If so, I hope you are well educated in cooling metals and arranging molecules in the metal. If so, i doubt u need to ask questions on this thread. __________________ When The Gates Drop, the Bull Stops!

11-03-2006, 11:13 AM	#22 (permalink)
wil_wil2 Location: Borden, Saskatchewan Posts: 764 Join Date: Feb 2006 Last On: 01-27-2007 03:16 PM Vehicle: 1968 C10 2nd Vehicle: 1989 Accord	Re: Tensile Strength when you machine something, the tensile and shear will change from it original properties.

11-03-2006, 01:54 PM	#23 (permalink)
Pineapple Location: Toronto Posts: 4,248 Join Date: Jan 2004 Last On: 09-06-2008 04:13 PM	Re: Tensile Strength No, it doesn't. Unless you didn't use coolant and heat up the material too much. Also please stop giving technical info because you've proven you don't have any. __________________ http://photos.yahoo.com/fredericklaw http://members.rankmyride.com/pineapplelaw

11-03-2006, 03:50 PM	#24 (permalink)
wil_wil2 Location: Borden, Saskatchewan Posts: 764 Join Date: Feb 2006 Last On: 01-27-2007 03:16 PM Vehicle: 1968 C10 2nd Vehicle: 1989 Accord	Re: Tensile Strength are you talking to me or FlyCanadianGuy? Pineapple correct me if I am wrong but wont tensile strength will change on a bolt, depending on its thread depth, width, rotation, ratio, ect. and please let pineapple respond first, since he is an engineer and you aren't

11-03-2006, 04:07 PM	#25 (permalink)
Pineapple Location: Toronto Posts: 4,248 Join Date: Jan 2004 Last On: 09-06-2008 04:13 PM	Re: Tensile Strength I'm talking to you wil wil2. Tensile strength will not change unless material is heat treated. A d2" bar will have same tensile strength as a d0.2" bar. How do you know FlyCanadianGuy is not an engineer? I really hope you're not. __________________ http://photos.yahoo.com/fredericklaw http://members.rankmyride.com/pineapplelaw

11-03-2006, 06:47 PM	#26 (permalink)
wil_wil2 Location: Borden, Saskatchewan Posts: 764 Join Date: Feb 2006 Last On: 01-27-2007 03:16 PM Vehicle: 1968 C10 2nd Vehicle: 1989 Accord	Re: Tensile Strength So two 3/8" bolts made out of 4140, one fine thread and one coarse will have the same tensil? Or one 3/8" and one 5/8" would have the same? And I am not questioning you knowledge, I am asking to make sure I understand you correctly.

11-03-2006, 09:41 PM	#27 (permalink)
FlyCanadianGuy Location: Stouffville Posts: 585 Join Date: Oct 2003 Last On: 08-26-2008 07:45 PM	Re: Tensile Strength Actually Pineapple is a Mechanical engineer and I went to school for it (didnt finish... but thats another story for another time) __________________ When The Gates Drop, the Bull Stops!

11-04-2006, 07:48 PM	#29 (permalink)
wil_wil2 Location: Borden, Saskatchewan Posts: 764 Join Date: Feb 2006 Last On: 01-27-2007 03:16 PM Vehicle: 1968 C10 2nd Vehicle: 1989 Accord	Re: Tensile Strength obviously I am missing something in my education, because I thought the yeild tensile strength changed with the parameter of the metal, and the ultimate tensile stayed the same. What is it called when you are testing a bolts twisting strength?(I hope that made sense)

11-05-2006, 12:33 AM	#30 (permalink)
Pineapple Location: Toronto Posts: 4,248 Join Date: Jan 2004 Last On: 09-06-2008 04:13 PM	Re: Tensile Strength All the strength stay the same for same material, as long as they went through same heat treating. Twisting is torsional strength which got nothing to do with your bolts breaking. It can be concider as both shear and tensile stress. __________________ http://photos.yahoo.com/fredericklaw http://members.rankmyride.com/pineapplelaw

11-05-2006, 03:07 PM	#31 (permalink)
wil_wil2 Location: Borden, Saskatchewan Posts: 764 Join Date: Feb 2006 Last On: 01-27-2007 03:16 PM Vehicle: 1968 C10 2nd Vehicle: 1989 Accord	Re: Tensile Strength does the torsional strength change depending on the objects parameter?

11-05-2006, 08:40 PM	#33 (permalink)
Pineapple Location: Toronto Posts: 4,248 Join Date: Jan 2004 Last On: 09-06-2008 04:13 PM	Re: Tensile Strength All strength are calculated base on yield strength. Go pick up your book and look at those formula. All strength are base on material never base on shape. No matter how many time you ask the same question the answer will stay the same. __________________ http://photos.yahoo.com/fredericklaw http://members.rankmyride.com/pineapplelaw

12-27-2006, 11:20 PM	#34 (permalink)
klue Posts: 288 Join Date: Aug 2005 Last On: 09-05-2008 09:58 PM	Re: Tensile Strength i think i understand the confusion. the idea is that the materials which are the same have the same strength as a mesurable value. but when you change the ( lets use size) the strenght of the OBJECT changes not the material. so basically, u need bigger bolts of the same material u are using now. or u need the same size but a stronger MATERIAL. help any?!?

03-06-2007, 06:39 PM	#35 (permalink)
Pineapple Location: Toronto Posts: 4,248 Join Date: Jan 2004 Last On: 09-06-2008 04:13 PM	Re: Tensile Strength Found this: ROCKCRAWLER.com - Grade 5 vs. Grade 8 Fasteners Someone did the math and I don't have to. __________________ http://photos.yahoo.com/fredericklaw http://members.rankmyride.com/pineapplelaw

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