|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Stiffness/load testing jig
This might be a long shot, but i'm wondering if anyone has any idea where/how to source a load testing jig?
I am partnering with a university here in Australia on a project, and need one of these to form part of our analysis. Thanks! |
Ads |
#2
|
|||
|
|||
Stiffness/load testing jig
On 14/4/21 9:45 am, Michael Briggs wrote:
This might be a long shot, but i'm wondering if anyone has any idea where/how to source a load testing jig? I am partnering with a university here in Australia on a project, and need one of these to form part of our analysis. Thanks! Sorry, I can't help with a testing jig. Is this article about you and your quest? https://road.cc/content/feature/how-...n-frame-280579 Good luck! -- JS |
#3
|
|||
|
|||
Stiffness/load testing jig
On Tuesday, April 13, 2021 at 4:45:36 PM UTC-7, Michael Briggs wrote:
This might be a long shot, but i'm wondering if anyone has any idea where/how to source a load testing jig? I am partnering with a university here in Australia on a project, and need one of these to form part of our analysis. Michael, most of these are built by the people using them. They are very specific to the job at hand. You have to have some engineering expertise in order to calculate the loads. This is something that Frank would be a good person to ask about. When he isn't being a jerk he does understand mechanical engineering well. |
#4
|
|||
|
|||
Stiffness/load testing jig
On Wednesday, 14 April 2021 at 10:26:39 UTC+10, James wrote:
On 14/4/21 9:45 am, Michael Briggs wrote: This might be a long shot, but i'm wondering if anyone has any idea where/how to source a load testing jig? I am partnering with a university here in Australia on a project, and need one of these to form part of our analysis. Thanks! Sorry, I can't help with a testing jig. Is this article about you and your quest? https://road.cc/content/feature/how-...n-frame-280579 Good luck! -- JS Thanks James. It's a complex space - but we're getting there |
#5
|
|||
|
|||
Stiffness/load testing jig
On Tue, 13 Apr 2021 16:45:33 -0700 (PDT), Michael Briggs
wrote: This might be a long shot, but i'm wondering if anyone has any idea where/how to source a load testing jig? I am partnering with a university here in Australia on a project, and need one of these to form part of our analysis. Thanks! Are you destructive load testing to the point of failure? In that case, just secure one end to the component you are testing, add pressure or tension to the other end, until it breaks. Somehow, I don't think that's what you want. My guess(tm) is that you a non-destructive test, that leave the bicycle in sufficiently good shape to be rideable. You would not do well if someone submitted a bicycle to you for testing and the frame fell apart when subsequently ridden. Therefore, in my never humble opinion, I suggest you forget about load testing and concentrate on crack, fault, void, gap, etc inspection. These might help for ultrasonic inspection: https://ruckuscomp.com/inspection 1,000 bicycles inspected per year. https://www.olympus-ims.com/en/insight/ruckus-composites-inspects-thousands-of-bikes-with-one-ultrasonic-thickness-gage/ https://www.olympus-ims.com/en/flaw-detectors/ Ever wonder how radiologists can look at various types of scans and see problems that most others fail to see? The main trick is that after seeing thousands of scans and images, they know what is considered normal. Any deviation from normal is grounds for suspicion. However, there are other tricks. In order for a comparison to be recognized as normal, the scan needs to produced in exactly the same manner, with the exact same settings, as the thousands of other scans of the same body area. In the past, the radiologists were having problems seeing a kidney stone. I suggested some image enhancement, which was immediately declared heresy by everyone involved. All the CT scans of the midsection had to take in the exact same way, with the exact same settings, etc or the analysts would never see a problem. If you're planning to use AI to detect voids and such in the CF layers, you'll probably run into the same problem. Also, there's no need to use ultrasound. CT scans and X-rays have been used to inspect bicycle frames: "Complete CT-scan of a carbon racing bike [2010]" https://www.youtube.com/watch?v=ve_Oa7jl_kQ "Realtime X-ray robotic inspection of a carbon bike frame" https://www.youtube.com/watch?v=QREKMI84vJg I suggest you talk to the people using the same tools for medical or industrial inspection and ask them what they can do with their equipment. No need to re-invent the wheel when you can borrow one from people next door. Good luck. -- Jeff Liebermann PO Box 272 http://www.LearnByDestroying.com Ben Lomond CA 95005-0272 Skype: JeffLiebermann AE6KS 831-336-2558 |
#6
|
|||
|
|||
Stiffness/load testing jig
On Wed, 14 Apr 2021 20:17:45 -0700, Jeff Liebermann
wrote: (...) "Nondestructive Evaluation of Carbon Fiber Bicycle Frames Using Infrared Thermography" https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5712988/ -- Jeff Liebermann PO Box 272 http://www.LearnByDestroying.com Ben Lomond CA 95005-0272 Skype: JeffLiebermann AE6KS 831-336-2558 |
#7
|
|||
|
|||
Stiffness/load testing jig
On 4/14/2021 10:17 PM, Jeff Liebermann wrote:
On Tue, 13 Apr 2021 16:45:33 -0700 (PDT), Michael Briggs wrote: This might be a long shot, but i'm wondering if anyone has any idea where/how to source a load testing jig? I am partnering with a university here in Australia on a project, and need one of these to form part of our analysis. Thanks! Are you destructive load testing to the point of failure? In that case, just secure one end to the component you are testing, add pressure or tension to the other end, until it breaks. Somehow, I don't think that's what you want. My guess(tm) is that you a non-destructive test, that leave the bicycle in sufficiently good shape to be rideable. You would not do well if someone submitted a bicycle to you for testing and the frame fell apart when subsequently ridden. Therefore, in my never humble opinion, I suggest you forget about load testing and concentrate on crack, fault, void, gap, etc inspection. These might help for ultrasonic inspection: https://ruckuscomp.com/inspection 1,000 bicycles inspected per year. https://www.olympus-ims.com/en/insight/ruckus-composites-inspects-thousands-of-bikes-with-one-ultrasonic-thickness-gage/ https://www.olympus-ims.com/en/flaw-detectors/ Ever wonder how radiologists can look at various types of scans and see problems that most others fail to see? The main trick is that after seeing thousands of scans and images, they know what is considered normal. Any deviation from normal is grounds for suspicion. However, there are other tricks. In order for a comparison to be recognized as normal, the scan needs to produced in exactly the same manner, with the exact same settings, as the thousands of other scans of the same body area. In the past, the radiologists were having problems seeing a kidney stone. I suggested some image enhancement, which was immediately declared heresy by everyone involved. All the CT scans of the midsection had to take in the exact same way, with the exact same settings, etc or the analysts would never see a problem. If you're planning to use AI to detect voids and such in the CF layers, you'll probably run into the same problem. Also, there's no need to use ultrasound. CT scans and X-rays have been used to inspect bicycle frames: "Complete CT-scan of a carbon racing bike [2010]" https://www.youtube.com/watch?v=ve_Oa7jl_kQ "Realtime X-ray robotic inspection of a carbon bike frame" https://www.youtube.com/watch?v=QREKMI84vJg I suggest you talk to the people using the same tools for medical or industrial inspection and ask them what they can do with their equipment. No need to re-invent the wheel when you can borrow one from people next door. Good luck. +1 -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#8
|
|||
|
|||
Stiffness/load testing jig
On Wednesday, April 14, 2021 at 8:17:52 PM UTC-7, wrote:
On Tue, 13 Apr 2021 16:45:33 -0700 (PDT), Michael Briggs wrote: This might be a long shot, but i'm wondering if anyone has any idea where/how to source a load testing jig? I am partnering with a university here in Australia on a project, and need one of these to form part of our analysis. Thanks! Are you destructive load testing to the point of failure? In that case, just secure one end to the component you are testing, add pressure or tension to the other end, until it breaks. Somehow, I don't think that's what you want. My guess(tm) is that you a non-destructive test, that leave the bicycle in sufficiently good shape to be rideable. You would not do well if someone submitted a bicycle to you for testing and the frame fell apart when subsequently ridden. Therefore, in my never humble opinion, I suggest you forget about load testing and concentrate on crack, fault, void, gap, etc inspection. These might help for ultrasonic inspection: https://ruckuscomp.com/inspection 1,000 bicycles inspected per year. https://www.olympus-ims.com/en/insight/ruckus-composites-inspects-thousands-of-bikes-with-one-ultrasonic-thickness-gage/ https://www.olympus-ims.com/en/flaw-detectors/ Ever wonder how radiologists can look at various types of scans and see problems that most others fail to see? The main trick is that after seeing thousands of scans and images, they know what is considered normal. Any deviation from normal is grounds for suspicion. However, there are other tricks. In order for a comparison to be recognized as normal, the scan needs to produced in exactly the same manner, with the exact same settings, as the thousands of other scans of the same body area. In the past, the radiologists were having problems seeing a kidney stone. I suggested some image enhancement, which was immediately declared heresy by everyone involved. All the CT scans of the midsection had to take in the exact same way, with the exact same settings, etc or the analysts would never see a problem. If you're planning to use AI to detect voids and such in the CF layers, you'll probably run into the same problem. Also, there's no need to use ultrasound. CT scans and X-rays have been used to inspect bicycle frames: "Complete CT-scan of a carbon racing bike [2010]" https://www.youtube.com/watch?v=ve_Oa7jl_kQ "Realtime X-ray robotic inspection of a carbon bike frame" https://www.youtube.com/watch?v=QREKMI84vJg I suggest you talk to the people using the same tools for medical or industrial inspection and ask them what they can do with their equipment. No need to re-invent the wheel when you can borrow one from people next door. Good luck. -- Jeff Liebermann PO Box 272 http://www.LearnByDestroying.com Ben Lomond CA 95005-0272 Skype: JeffLiebermann AE6KS 831-336-2558 Jeff, that is NOT how you destructive test mechanical components. Simply breaking them tells you little to nothing. You have to have some sort of fatigue limit understanding. |
#9
|
|||
|
|||
Stiffness/load testing jig
On 15/4/21 8:55 am, Michael Briggs wrote:
On Wednesday, 14 April 2021 at 10:26:39 UTC+10, James wrote: On 14/4/21 9:45 am, Michael Briggs wrote: This might be a long shot, but i'm wondering if anyone has any idea where/how to source a load testing jig? I am partnering with a university here in Australia on a project, and need one of these to form part of our analysis. Thanks! Sorry, I can't help with a testing jig. Is this article about you and your quest? https://road.cc/content/feature/how-...n-frame-280579 Good luck! -- JS Thanks James. It's a complex space - but we're getting there Michael, I wonder whether it would be best to brew your own using something from this range? https://www.tslot.com.au/ A mechanical engineering mate worked for the Alchemy bicycle frames business many years ago, and he ended up making his own test jig for cyclic load testing of certain parts. A jig with an electric motor and gearbox with a cam to apply a specific deflection, and a counter to keep track of the cycles. -- JS |
#10
|
|||
|
|||
Stiffness/load testing jig
On Thursday, April 15, 2021 at 7:46:10 PM UTC-7, James wrote:
On 15/4/21 8:55 am, Michael Briggs wrote: On Wednesday, 14 April 2021 at 10:26:39 UTC+10, James wrote: On 14/4/21 9:45 am, Michael Briggs wrote: This might be a long shot, but i'm wondering if anyone has any idea where/how to source a load testing jig? I am partnering with a university here in Australia on a project, and need one of these to form part of our analysis. Thanks! Sorry, I can't help with a testing jig. Is this article about you and your quest? https://road.cc/content/feature/how-...n-frame-280579 Good luck! -- JS Thanks James. It's a complex space - but we're getting there Michael, I wonder whether it would be best to brew your own using something from this range? https://www.tslot.com.au/ A mechanical engineering mate worked for the Alchemy bicycle frames business many years ago, and he ended up making his own test jig for cyclic load testing of certain parts. A jig with an electric motor and gearbox with a cam to apply a specific deflection, and a counter to keep track of the cycles. That is correct and the T-slot construction would allow you to put in loads in different directions. As I said. each part is load specific and just using a crank or a cam to load things doesn't tell you what the stresses and strains are. This really is a job for a mechanical engineer though you could easily design a test bed to hold a bike frame or whatever it is you intend to test. But application of the loads required knowledge of the material and how to apply the stresses. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
On frame stiffness | James[_8_] | Techniques | 26 | June 11th 17 01:25 PM |
Tire-making: testing, pre-testing, ect. | DougC | Techniques | 11 | October 31st 11 03:42 PM |
Lateral stiffness | [email protected] | Techniques | 36 | June 23rd 10 11:03 PM |
wheel stiffness | Francesco Devittori | Techniques | 33 | May 27th 05 04:46 AM |
Shoe Stiffness | Ian G Batten | UK | 6 | April 4th 04 02:55 AM |