View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000639 | Dwarf Fortress | Geology | public | 2010-04-06 10:16 | 2010-07-06 03:04 |
| Reporter | Squirrelloid | Assigned To | Toady One | ||
| Priority | low | Severity | minor | Reproducibility | always |
| Status | resolved | Resolution | fixed | ||
| Product Version | 0.31.01 | ||||
| Fixed in Version | 0.31.09 | ||||
| Summary | 0000639: Some impact elasticity values are clearly wrong | ||||
| Description | Impact Elasticity for some metals in DF: Gold 600 Iron 635 Steel 675 Silver 1080 Bronze 600 I'm assuming that high elasticity => deforms more under a given stress, as per real world definition (Strain = E * stress). While I can't find impact elasticity for real world data, Young's Modulus (inverse tensile elasticity) of gold and silver are virtually identical. Given their similar behavior under many other circumstances based on their periodic table placement and properties, I would assume this holds true for all types of elasticity. Its certainly the case that gold should not be stiffer than iron and steel. In fact, it should probably be steel < iron << gold ~= silver, which means one of iron or steel is also wrong. My best guess is that steel should be stiffer than bronze as well, and so steel should have an impact elasticity <600. (I've mostly looked at weapon-capable metals and impact elasticity, so there may be other inappropriate values) | ||||
| Steps To Reproduce | Its an incorrect data entry in the raws | ||||
| Tags | No tags attached. | ||||
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Please direct all discussion to http://www.bay12games.com/forum/index.php?topic=53072.0 |
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DF's elasticity should be called "STRAIN_AT_YIELD", I think. I'm not sure what permutations it went through to arrive at its current name, but at some point it didn't get a good name. In any case, they are all just the yield divided by a modulus (young's, bulk, etc. depending on case), and I think the last digit is dropped or something. I'm not sure if Young's modulus etc. even applies at yield, but that's what it is doing. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2010-04-06 10:16 | Squirrelloid | New Issue | |
| 2010-04-06 10:25 |
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Note Added: 0001513 | |
| 2010-07-06 03:04 | Toady One | Note Added: 0009674 | |
| 2010-07-06 03:04 | Toady One | Status | new => resolved |
| 2010-07-06 03:04 | Toady One | Fixed in Version | => 0.31.09 |
| 2010-07-06 03:04 | Toady One | Resolution | open => fixed |
| 2010-07-06 03:04 | Toady One | Assigned To | => Toady One |
