37 Thermal expansion

Use thermal expansion (or contraction) of materials.
  • Shrink wrap holding a pack of 6 water bottles together.
  • Fit a tight joint together by cooling the inner part to contract, heating the outer part to expand, putting the joint together, and returning to equilibrium.

If thermal expansion is being used, use multiple materials with different coefficients of thermal expansion.
  • Shrink-fitting a metal bearing onto a shaft by heating the outer ring to expand it, then letting it cool and contract for a tight grip.
Principe 37 : Shrink wrap holding a pack of 6 water bottles together.


From TRIZ to ASIT

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Concrete examples

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Is this TRIZ principle frequently used?

This principle is rarely used with 60 instances in the matrix.

This principle is proposed to solve the following contradictions:

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1/10 1/11 1/39 2/30 3/29 4/13 6/11 7/10 7/11 8/10 8/39 10/1 10/6 10/7 10/8 10/20 10/21 10/25 10/29 10/32 10/37 10/39 11/1 11/6 11/19 11/23 11/25 11/30 11/37 11/39 12/10 13/4 14/30 19/21 20/10 20/30 21/3 21/19 22/23 23/11 25/1 25/10 25/11 29/3 30/7 30/11 30/14 30/20 32/11 35/12 35/36 35/39 36/35 36/37 37/11 37/36 39/1 39/8 39/11 39/35


The colour indicates the ranking of the proposed principle to solve the contradiction: 1st, 2nd, 3rd, 4th.
This ranking reflects the frequency of occurrence of the principle in the analysed patents for this type of contradiction.
When a principle appears in first position, it means that it is statistically the most used in the patents studied for this type of problem.

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