Checks if a clash is detected between the fastener geometry and any other part or fastener geometry. If a clash is detected, the first part detected is indicated in the reports.
Considers the fastener instance position and the piloting part defined for this fastener instance in the stacking. The rule computes the closest surface of the piloting part to the fastener instance and determines the normal by projecting the fastener instance on this surface.
Checks the consistency between the position of the fastener and its associated fastened parts stored in the engineering connection.
Fastener Border to Flange Edge Distance (FBE)
Behavior:
If the distance is greater than or equal to D, the rule is
OK.
If the distance is less than D, the rule is
KO.
Default Values:
Minimum
Distance (D) = 50 mm
Criticality: Medium
Spot Center Distance to Flange Edge (FCE)
Behavior:
If the distance is greater than or equal to D, the rule is
OK.
If the distance is less than D, the rule is
KO.
Default Values:
Minimum
Distance (D) = 60 mm
Criticality: Medium
Fastener in Clash (FCLS)
By default, this rule applies to flexible fastener rivet (self-pierced). You can customize it by editing the standard file (Fst_Standard.xls).
Behavior:
If no clash is detected between the fastener geometry and any other part or fastener geometry, the rule is OK.
If a clash is detected between the fastener geometry and any other part or fastener geometry, the rule is KO and the diagnostic mentions the list of parts or fasteners in clash with the fastener geometry. The first part detected is indicated in the reports.
FCLS is KO
In the example below, a clash has been detected between the fastener (F1.1) and the part (P1.1).
Default criticality: High
Flexible Fastener Consistency Rule (FFLC)
Behavior:
The rule is applicable for flexible fasteners only.
The total thickness (T) of fastened parts is computed at the fastener location, along the fastener normal direction.
If the length of the flexible fastener is equal to
or greater than T (within the flexible fastener tolerance value), then the
rule is OK.
If the length of the flexible fastener is less than T, the rule is KO.
If the length of the flexible fastener is greater than T (beyond the flexible fastener tolerance value), then the rule is KO.
Default criticality: Medium
Minimum Spot Distance
Rule (MSP)
Behavior:
If the distance is greater than or equal to D, the rule is OK.
If the distance is less than D, the rule is KO.
Default criticality: Low
Fastener Positioned at
Common Node (FPCN)
Behavior:
If the fastener is positioned under the common parent node, the rule is OK.
If the fastener is not positioned under the common parent node, the rule is KO.
Default criticality: Medium
Normal Consistency with
Pilot Part (NCPP)
Behavior:
If the computation gives the same result as the current normal, the rule is OK.
If the computation gives the different result as the current normal, the rule is KO.
Default criticality: High
Stacking Consistency (STK)
Behavior:
If the fastened parts (in Fastener Connection) are exactly the same as the one computed considering both limits, the rule is OK.
If at least one part is missing in the fastener connection, the rule is KO and the diagnostic provides the list of missing parts.
If at least one part in the fastener connection is not in geometric clash with the current fastener considering both limits, then the rule is KO and the diagnostic provides the list of parts to remove from the fastener connection.
A parameter will be available on the rule description in standard to choose if rule should return OK or KO in case of empty stacking and no geometric clash. If the parameter is set to TRUE, rule will return KO in this case, if set to FALSE it will return OK.
Sometimes, it is important that the order in which fastener intersects parts, should be same as order of fastened parts stored in the Engineering connection. A parameter 'Fst_RULES_STK_OrderCheck' is available in fastener standard file (Fst_Standard.xls) to choose if STK rule should return OK or KO. You can override the parameter values for specific fastener types, by defining the parameter in fastener reference type file.
To keep check of strict order of parts may be very strong condition. Hence, it can be weakened by allowing to have parts in reverse in both sets (Parts found in fastener intersections and parts in engineering connection). This is achieved by adding the 'Fst_RULES_STK_AllowReverseOrder' parameter in fastener standard file. Similar to the previous parameter, this parameter can also be overridden in fastener reference type file.
