View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0009976 | Dwarf Fortress | Material Properties | public | 2016-08-23 16:49 | 2017-07-30 15:48 |
| Reporter | chaosvolt | Assigned To | |||
| Priority | normal | Severity | minor | Reproducibility | have not tried |
| Status | new | Resolution | open | ||
| Summary | 0009976: Possibly incorrect value for bone (and maybe stone) shear strength | ||||
| Description | Attempts to look up bone's shear values has led to my finding commonly-cited numbers to be different from what the game uses. In particular, the raws cite referencing wikipedia, and their article for bone ( https://en.wikipedia.org/wiki/Bone ) states a tensile strength that the raw is in the right range of (104-121 MPa versus 105000 KPa), but the raws use the same shear strength for the shear value, with said page cites two sources as 51.6 MPa (or in DF terms, 51600). Other cursory searches have shown that number come up elsewhere. I'm not sure what the real-world shear FRACTURE of bone is though. I then started to look up the shear value of marble, which the raws state the stone template based some values off of. Getting that value is proving to be harder, and I don't know where Toady got the value from. | ||||
| Additional Information | Changing this would make combatants rather more fragile, and might have variable effects on modding (especially those focused on adventure-mode crafting). Stone and obsidian currently would still cut worse than this altered bone value, but I also have no idea where these values were obtained. Plus, currently DF logic has sandstone cutting as well as chert. | ||||
| Tags | bone, material, material template, research, shear strength, stone | ||||
|
|
Another problem with fixing this is that the armor damage system is very poorly balanced. Already mundane wildlife bites will tear through bone armor even if it's been BUFFED to exceed the strength of copper, nerfing would fuck that up even worse. ._. |
|
|
Update. Found one possibly useful source for marble's shear strength. Values for marble vary, including 4964.23, 11031.61, even 16547.42 kpa So that at least is in the expected range. Source: http://nceg.uop.edu.pk/GeologicalBulletin/Vol-26-1993/Vol-26-1993-Paper11.pdf |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2016-08-23 16:49 | chaosvolt | New Issue | |
| 2016-08-27 10:26 | chaosvolt | Tag Attached: bone | |
| 2016-08-27 10:26 | chaosvolt | Tag Attached: material | |
| 2016-08-27 10:26 | chaosvolt | Tag Attached: material template | |
| 2016-08-27 10:26 | chaosvolt | Tag Attached: research | |
| 2016-08-27 10:26 | chaosvolt | Tag Attached: shear strength | |
| 2016-08-27 10:26 | chaosvolt | Tag Attached: stone | |
| 2016-08-28 11:03 | chaosvolt | Note Added: 0035815 | |
| 2016-08-28 11:05 | chaosvolt | Note Edited: 0035815 | |
| 2017-07-30 15:48 | chaosvolt | Note Added: 0036683 |
