Is this a crack on the carbon frame? The 2019 Stack Overflow Developer Survey Results Are In Unicorn Meta Zoo #1: Why another podcast? Announcing the arrival of Valued Associate #679: Cesar ManaraMetal seat post with carbon fiber frame?Repair superficial damage to a carbon frameExtending integrated carbon seat tubeCarbon frame damageCarbon frame cracksDoes a carbon frame need two-bolt seat clamp?Should I worry about a chipped carbon mountain bike frame?Lugged carbon frame repaircan I use an aluminium seatpost to install a tagalong on a carbon fiber frame?carbon seat post to carbon seat tube - necessary to loosen periodically to prevent seizing in place?
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Is this a crack on the carbon frame?
The 2019 Stack Overflow Developer Survey Results Are In
Unicorn Meta Zoo #1: Why another podcast?
Announcing the arrival of Valued Associate #679: Cesar ManaraMetal seat post with carbon fiber frame?Repair superficial damage to a carbon frameExtending integrated carbon seat tubeCarbon frame damageCarbon frame cracksDoes a carbon frame need two-bolt seat clamp?Should I worry about a chipped carbon mountain bike frame?Lugged carbon frame repaircan I use an aluminium seatpost to install a tagalong on a carbon fiber frame?carbon seat post to carbon seat tube - necessary to loosen periodically to prevent seizing in place?
I have just noticed this on the top of my saddle bar and where the seat post clamp is. Is it a crack probably caused by the saddle pressure?
carbon
asked Apr 6 at 20:49
AmirAmir
1305
add a comment |
I have just noticed this on the top of my saddle bar and where the seat post clamp is. Is it a crack probably caused by the saddle pressure?
carbon
asked Apr 6 at 20:49
AmirAmir
1305
3
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28
add a comment |
I have just noticed this on the top of my saddle bar and where the seat post clamp is. Is it a crack probably caused by the saddle pressure?
carbon
asked Apr 6 at 20:49
AmirAmir
1305
I have just noticed this on the top of my saddle bar and where the seat post clamp is. Is it a crack probably caused by the saddle pressure?
carbon
carbon
asked Apr 6 at 20:49
AmirAmir
1305
asked Apr 6 at 20:49
AmirAmir
1305
edited Apr 6 at 21:00
Amir
asked Apr 6 at 20:49
AmirAmir
1305
asked Apr 6 at 20:49
AmirAmir
1305
asked Apr 6 at 20:49
AmirAmir
1305
1305
3
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28
add a comment |
3
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28
3
3
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28
add a comment |
1 Answer
1
active
oldest
votes
Doesn’t look like a crack, looks more like a surface void that formed during the resin injection molding. These types of imperfections are not uncommon, especially on the inside of the frame where you can’t see them. Less common to see them on the outside as they are usually caught in quality control inspections. While they are not ideal, as areas with voids will be somewhat weaker than areas without voids (depending on the size and depth of the void), they are not critical like a crack.
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14595
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Doesn’t look like a crack, looks more like a surface void that formed during the resin injection molding. These types of imperfections are not uncommon, especially on the inside of the frame where you can’t see them. Less common to see them on the outside as they are usually caught in quality control inspections. While they are not ideal, as areas with voids will be somewhat weaker than areas without voids (depending on the size and depth of the void), they are not critical like a crack.
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14595
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
add a comment |
Doesn’t look like a crack, looks more like a surface void that formed during the resin injection molding. These types of imperfections are not uncommon, especially on the inside of the frame where you can’t see them. Less common to see them on the outside as they are usually caught in quality control inspections. While they are not ideal, as areas with voids will be somewhat weaker than areas without voids (depending on the size and depth of the void), they are not critical like a crack.
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14595
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
add a comment |
Doesn’t look like a crack, looks more like a surface void that formed during the resin injection molding. These types of imperfections are not uncommon, especially on the inside of the frame where you can’t see them. Less common to see them on the outside as they are usually caught in quality control inspections. While they are not ideal, as areas with voids will be somewhat weaker than areas without voids (depending on the size and depth of the void), they are not critical like a crack.
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14595
Doesn’t look like a crack, looks more like a surface void that formed during the resin injection molding. These types of imperfections are not uncommon, especially on the inside of the frame where you can’t see them. Less common to see them on the outside as they are usually caught in quality control inspections. While they are not ideal, as areas with voids will be somewhat weaker than areas without voids (depending on the size and depth of the void), they are not critical like a crack.
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14595
edited Apr 6 at 21:41
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14595
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14595
answered Apr 6 at 21:28
Rider_XRider_X
25.1k14595
25.1k14595
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
add a comment |
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
5
5
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
Most importantly, the irregularity seen in the image has mostly smooth edges (except where worn/machined for the clamp). A crack will generally have sharp edges. However, that very thin line below the more obvious dent could be a crack. But it's more likely just a less severe indication of the mold seam that created the dents at the top. A closer examination would be needed to see if its edge are rounded or sharp.
– Daniel R Hicks
Apr 6 at 22:02
2
2
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
Even a void is bad, as it serves as a stress concentrator and results in rapid fatigue cracking, possibly leading to eventual catastrophic failure.
– Sean
Apr 7 at 3:07
4
4
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
@Sean a void in the structural carbon is bad because in interrupts the grain structure, but typically we can’t see these types of void because they are within the carbon layers. Most frames have a cosmetic layer of carbon wrapping on the outside, a void here is less critical. The void we see here is likely superficial, affecting the cosmetic layer.
– Rider_X
Apr 7 at 4:02
add a comment |
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3
Take this same photo monthly, and compare it over time. If the line changes and grows in width or thickness then its a crack. If not, it isn't.
– Criggie♦
Apr 6 at 23:28