v0.34:Material science - Revision history

Benderdragon: /* Conversion of Edged Damage to Blunt Damage */ Added info about penetration depth

2020-02-16T05:18:08Z

Conversion of Edged Damage to Blunt Damage: Added info about penetration depth

128.84.231.46: /* Interactions Between Projectiles and Armor */

2014-05-21T18:28:46Z

Interactions Between Projectiles and Armor

Brightgalrs: /* The Armor Absorbs the Force of the Collision */clean up, typos fixed: etc) → etc.)

2014-04-08T22:53:01Z

The Armor Absorbs the Force of the Collision: clean up, typos fixed: etc) → etc.)

Latias1290: formatting

2014-04-06T13:15:32Z

formatting

93.192.234.118: small logic fix: bolt-->armor

2014-02-01T05:58:27Z

small logic fix: bolt-->armor

PeridexisErrant: Changed quality rating from "Fine" to "Exceptional" using the rating script

2013-10-09T23:57:23Z

Changed quality rating from "Fine" to "Exceptional" using the rating script

Resident Mario: bump down

2013-07-12T17:16:52Z

bump down

Resident Mario: + tmp

2013-07-12T17:16:36Z

+ tmp

Pirate Bob: adamantine bolts won't deflect off other armor, as bolts won't deflect if they are made out of a superior material

2013-06-14T00:37:57Z

adamantine bolts won't deflect off other armor, as bolts won't deflect if they are made out of a superior material

Loci: moved DF2012:Material to DF2012:Material science: match prior versions

2013-02-04T23:47:34Z

moved DF2012:Material to DF2012:Material science: match prior versions

@@ Line 65: / Line 65: @@
 ====Conversion of Edged Damage to Blunt Damage====
 If the momentum of the projectile is not too high, then chain armor can convert the edged damage normally caused by projectiles to blunt damage, resulting in chips, fractures, jams and bruises, but no tears or cuts.  Plate armor does not appear to provide this type of protection under any conditions tested so far.  It is not yet known how the momentum needed for edged damage to penetrate chain armor is calculated, but for the cases examined the momentum needed is many times larger than those observed for in-game projectiles.
 ====The Projectile Absorbs the Force of the Collision====

@@ Line 72: / Line 72: @@
 *Mass=armor SOLID_DENSITY times the volume from the last step
 *If the IMPACT_YIELD of the projectile is less than mass*(800/157)/PROJECTILE_SIZE, then the projectile deforms and is reported as “deflected”.
-In-game, this type of deflection is observed for wood bolts impacting metal armor, and explains why adamantine is observed to be the worst armor for deflecting wood bolts, as it has the lowest density. As explained below, adamantine can barely stop wood bolts using the "Armor Absorbs the Force of the Collision" mechanism, and wood bolts would easily fracture copper or steel armor were it not for the higher densities of those metals causing the armor to absorb the force of the collision instead.
+In-game, this type of deflection is observed for wood bolts impacting metal armor, and explains why adamantine is observed to be the worst armor for deflecting wood bolts, as it has the lowest density. As explained below, adamantine can barely stop wood bolts using the "Armor Absorbs the Force of the Collision" mechanism, and wood bolts would easily fracture copper or steel armor were it not for the higher densities of those metals causing the projectile to absorb the force of the collision instead.
 ====The Armor Absorbs the Force of the Collision====

@@ Line 88: / Line 88: @@
 *The function round100(x) is equal to 100 if x is less than 100, and 100*floor(x/100) otherwise (rounded down to the nearest 100).
-It unclear if or how the thicknesses of multiple armor layers covering one body part stack.  This formula is approximate, and the exact values of the coefficients in the denominator may not be accurate.  The amount of protection provided drops sigmoidally from 100% to zero over a fairly narrow range.  Furthermore, negative status of the target creature (fallen over, unconscious, etc) are known to significantly reduce armor protection provided.  These numbers will roughly predict the results for an ideal, uninjured dwarf, and worse protection should be expected in other cases.  The exact manner in which status affects impact armor protection has not yet been explored.
+It unclear if or how the thicknesses of multiple armor layers covering one body part stack.  This formula is approximate, and the exact values of the coefficients in the denominator may not be accurate.  The amount of protection provided drops sigmoidally from 100% to zero over a fairly narrow range.  Furthermore, negative status of the target creature (fallen over, unconscious, etc.) are known to significantly reduce armor protection provided.  These numbers will roughly predict the results for an ideal, uninjured dwarf, and worse protection should be expected in other cases.  The exact manner in which status affects impact armor protection has not yet been explored.
 The manner in which armor offers protection is different depending on whether the bolt momentum is greater than 50000/IMPACT_STRAIN_AT_YIELD.  If momentum is less than this threshold, then armor can completely deflect projectiles, while if it is larger, armor can significantly slow projectiles so that they cause only bruises (not tears, chips, fractures, or jams).

@@ Line 77: / Line 77: @@
 This form of deflection depends only on the momentum, but not the material, of the projectile.  The armor will provide 50% protection from projectiles if
-:momentum = (IF-IY/2)*round100(C*S)/(2400000-AU*10000-Q*30000)
+ momentum = (IF-IY/2)*round100(C*S)/(2400000-AU*10000-Q*30000)
-where IF=IMPACT_FRACTURE and IY=IMPACT_YIELD of the armor material, C is CONTACT_AREA of the projectile (although it is the smaller of the projectile's contact area and the body part struck's contact area), and S=LAYER_SIZE of the armor item(s) covering the body part struck, AU is the target's armor user skill (0=none, 16=legendary) and Q is the armor quality (0=none, 5=masterwork).  The function round100(x) is equal to 100 if x is less than 100, and 100*floor(x/100) otherwise (rounded down to the nearest 100).  It unclear if or how the thicknesses of multiple armor layers covering one body part stack.  This formula is approximate, and the exact values of the coefficients in the denominator may not be accurate.  The amount of protection provided drops sigmoidally from 100% to zero over a fairly narrow range.  Furthermore, negative status of the target creature (fallen over, unconscious, etc) are known to significantly reduce armor protection provided.  These numbers will roughly predict the results for an ideal, uninjured dwarf, and worse protection should be expected in other cases.  The exact manner in which status affects impact armor protection has not yet been explored.
 The manner in which armor offers protection is different depending on whether the bolt momentum is greater than 50000/IMPACT_STRAIN_AT_YIELD.  If momentum is less than this threshold, then armor can completely deflect projectiles, while if it is larger, armor can significantly slow projectiles so that they cause only bruises (not tears, chips, fractures, or jams).

@@ Line 72: / Line 72: @@
 *Mass=armor SOLID_DENSITY times the volume from the last step
 *If the IMPACT_YIELD of the projectile is less than mass*(800/157)/PROJECTILE_SIZE, then the projectile deforms and is reported as “deflected”.
-In-game, this type of deflection is observed for wood bolts impacting metal armor, and explains why adamantine is observed to be the worst armor for deflecting wood bolts, as it has the lowest density. As explained below, adamantine can barely stop wood bolts using the "Armor Absorbs the Force of the Collision" mechanism, and wood bolts would easily fracture copper or steel armor were it not for the higher densities of those metals causing the bolt to absorb the force of the collision instead.
+In-game, this type of deflection is observed for wood bolts impacting metal armor, and explains why adamantine is observed to be the worst armor for deflecting wood bolts, as it has the lowest density. As explained below, adamantine can barely stop wood bolts using the "Armor Absorbs the Force of the Collision" mechanism, and wood bolts would easily fracture copper or steel armor were it not for the higher densities of those metals causing the armor to absorb the force of the collision instead.
 ====The Armor Absorbs the Force of the Collision====

@@ Line 1: / Line 1: @@
-{{quality|Fine|02:27, 11 May 2012 (UTC)}}
+{{Quality|Exceptional|23:57, 9 October 2013 (UTC)}}
 {{av}}
 {{Material properties}}

← Older revision		Revision as of 17:16, 12 July 2013
Line 1:		Line 1:
−	{{quality\|Fine\|02:27, 11 May 2012 (UTC)}}{{av}}	+	{{quality\|Fine\|02:27, 11 May 2012 (UTC)}}
		+	{{Material properties}}
		+	{{av}}
	[[Material\|Materials]] have a number of properties representing real world variables that describe how they respond to inputs. In particular, the game now has a number of variables that describe what happens to a material when it's put under stress.		[[Material\|Materials]] have a number of properties representing real world variables that describe how they respond to inputs. In particular, the game now has a number of variables that describe what happens to a material when it's put under stress.

@@ Line 80: / Line 80: @@
 The manner in which armor offers protection is different depending on whether the bolt momentum is greater than 50000/IMPACT_STRAIN_AT_YIELD.  If momentum is less than this threshold, then armor can completely deflect projectiles, while if it is larger, armor can significantly slow projectiles so that they cause only bruises (not tears, chips, fractures, or jams).
-This type of collision is only observed in-game for bolts with densities less than about 750 (most wood, adamantine) deflecting off adamantine armor, or adamantine bolts off most metal armors.  In all other cases the bolt momentum is far to high to be stopped by any armor using this mechanism.
+This type of collision is only observed in-game for bolts with densities less than about 750 (most wood, adamantine) deflecting off adamantine armor.  In all other cases the bolt momentum is far to high to be stopped by any armor using this mechanism.
 {{Category|Materials|*}}

← Older revision	Revision as of 23:47, 4 February 2013
(No difference)