0006303: The elastic properties for steel, bronze, and brass are physically impossible.

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Date Submitted

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0006303

Dwarf Fortress

Items

public

2013-04-09 13:50

2013-04-09 13:52

Reporter

zzedar

Assigned To

Priority

low

Severity

tweak

Reproducibility

N/A

Status

new

Resolution

open

Platform

OS Version

Product Version

0.34.11

Target Version

Fixed in Version

Summary

0006303: The elastic properties for steel, bronze, and brass are physically impossible.

Description

Some metals have impossible combinations of material properties.

The value for steel's shear modulus is inconsistent with the values for its bulk modulus and Young's modulus. According to the raws, the Young modulus for the variety of steel used in DF is 200, and the bulk modulus is 160. Thus, the shear modulus should be (3*160*200)/(9*160-200)=77.4, rather than the 200 listed in the raws. This is consistent with real world steel, which typically has a shear modulus between (approximately) 76 and 82 GPa.

Several other metals (all of them alloys) are likewise impossible.

Issue History
Date Modified	Username	Field	Change
2013-04-09 13:50	zzedar	New Issue
2013-04-09 13:52	zzedar	Tag Attached: material
2013-04-09 13:52	zzedar	Tag Attached: metal

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