Comparison of thermal shock profiles

AI Thread Summary
The discussion centers on comparing two thermal shock test profiles that differ in temperature change rates and dwell times at high and low temperatures. The user seeks guidance on understanding the severity of each profile to select a suitable component for qualification limits. A reference to the STRIFE profile is made, highlighting a standard ramp rate of 10°C/minute, which is considered effective for identifying design and manufacturing issues. Concerns are raised about faster ramp rates potentially causing false failures, while slower rates may not adequately reveal reliability problems. The conversation emphasizes the importance of clearly labeling test profiles for accurate analysis.
mrajkumar
Messages
11
Reaction score
0
Could someone help me in comparing 2 different thermal shock test profiles effect on a component. The 2 profiles are varied in deg C /min change and also the dwell time in low and high tempwratures. Any references are highly appreciated. Thank you
 
Engineering news on Phys.org
mrajkumar said:
Could someone help me in comparing 2 different thermal shock test profiles effect on a component. The 2 profiles are varied in deg C /min change and also the dwell time in low and high tempwratures. Any references are highly appreciated. Thank you
Looks like the profiles did not Upload. Can you try again? Use the UPLOAD button in the lower right of the Edit window to upload PDF or JPEG images... :smile:
 
Also, is this for schoolwork?
 
I am trying to compare the thermal shock profiles to understand the severity of each and ways to compare them. This is required to choose a component for my required qualification limit. I've uploaded the profile herewith. Requesting a guidance.
Thermal shock2.jpg
 

Attachments

  • Thermal shock2.jpg
    Thermal shock2.jpg
    53.8 KB · Views: 585
I'm assuming the Temperature is in degrees C and the Time is in minutes? (It's best to always label your axes with units to avoid ambiguity) :smile:

The standard temperature stress profile that I'm familiar with (learned first at Hewlett Packard many years ago) is the STRIFE profile, which uses 10C/minute temperature ramps (hence liquid CO2 cooling is required for the ramps down), along with power cycling during the ramps and after soaking at the extremes of the profile. Using ramps faster than about 10C per minute can cause false failures, depending on how complex your electronics are, and going more slowly than 10C/minute doesn't really help you find all of the design and manufacturing issues that you would like to find in this kind of reliability testing.

The profile that we typically use on medium-size Industrial temperature range products is shown below. The vertical cross-hatched bars show where the power to the UUTs is turned off. We typically also add in some off times during some of the temperature ramps. Are the ramp rates for the faster profile you show in your figure close to 10C/minute?

LTS-20 STRIFE Profile.JPG
 

Attachments

  • LTS-20 STRIFE Profile.JPG
    LTS-20 STRIFE Profile.JPG
    30.1 KB · Views: 462

Thread 'Race car suspension Class'

Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
View full post »

Thread 'Cantilever help'

I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
View full post »
Thread 'What's the most likely cause for this carbon seal crack?'

Thread 'What's the most likely cause for this carbon seal crack?'

We have a molded carbon graphite seal that is used in an inline axial piston, variable displacement hydraulic pump. One of our customers reported that, when using the “A” parts in the past, they only needed to replace them due to normal wear. However, after switching to our parts, the replacement cycle seems to be much shorter due to “broken” or “cracked” failures. This issue was identified after hydraulic fluid leakage was observed. According to their records, the same problem has occurred...
View full post »

Similar threads

What are the causes of thermal stress?
Replies
8
Views
2K
Shear stress damage due to thermal gradient
Replies
6
Views
2K
Heat Transfer From Resistance Element to Metal Component
Replies
2
Views
2K
Engineering Help with a presentation on thermal analysis of an opto-mechanical system
Replies
17
Views
4K
How to calculate freezing time for a moist food by-product (75% water)
Replies
6
Views
628
Temperature profiles and thermal resistance
Replies
9
Views
2K
Construction Can a radiant barrier in the attic be effective?
Replies
26
Views
2K
Thermal effects in aircraft engines - sudden/rapid cooling
Replies
9
Views
2K
Just curious about many things like hydrostatics
Replies
28
Views
4K
Calibrating Pump/Venturi (Air) in a Closed Recirculating Water System
Replies
1
Views
307

Hot Threads

Recent Insights

Back
Top