Analyzing method of spot welded portion, analyzing program of spot welded portion, recording medium and analyzing apparatus of spot welded portion

Patent metadata

Field	Value
Publication number	US-9816904-B2
Application number	US-201214652698-A
Country	US
Kind code	B2
Filing date	Dec 17, 2012
Priority date	Dec 17, 2012
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

An analyzing method of a spot welded portion, includes: acquiring bar elements as the spot welded portion; extracting other bar elements existing at a periphery of a target bar element which is targeted among the acquired bar elements; determining whether or not there is a bar element which shares the same end point with the target bar element among the extracted bar elements; determining that the target bar element and the bar element which shares the same end point with the target bar element are a three-layer spot welded portion when it is determined that there is the bar element which shares the same end point with the target bar element; and determining whether or not there is a bar element whose distance between elements with the target bar element is within a predetermined distance among the extracted bar elements when it is determined that there is not the bar element which shares the same end point with the target bar element, and determining that the target bar element and the extracted bar element are not the three-layer spot welded portion when it is determined that there is not the bar element within the predetermined distance.

First claim

The invention claimed is:

1. An analyzing method of a spot welded portion, comprising:
acquiring bar elements by which the spot welded portion to be analyzed is modeled;
extracting other bar elements existing at a periphery of a target bar element which is targeted among the acquired bar elements;
determining whether or not there is a bar element which shares the same end point with the target bar element among the extracted bar elements, by comparing an end point of the target bar element and an end point of the extracted bar elements;
determining that the target bar element and the bar element which shares the same end point with the target bar element are a three-layer spot welded portion where three pieces of plate materials are stacked and spot welded when it is determined that there is the bar element which shares the same end point with the target bar element; and
determining whether or not there is a bar element whose distance between the extracted bar elements and the target bar element is within a predetermined distance among the extracted bar elements when it is determined that there is not the bar element which shares the same end point with the target bar element, and determining that the target bar element and the extracted bar element are not the three-layer spot welded portion when it is determined that there is not the bar element within the predetermined distance,
wherein the distance between the extracted bar elements and the target bar element is a distance between the end point of the extracted bar element and the end point of the target bar element on a common plate material, and the predetermined distance is a thickness of the plate materials or a nugget diameter of the spot welded portion.

2. The analyzing method of the spot welded portion according to claim 1 , further comprising:
selecting a bar element whose distance between the end point of the extracted bar elements and the end point of the target bar element is the shortest among the extracted bar elements as an object bar element when it is determined that there is the bar element whose distance between the end point of the extracted bar elements and the end point of the target bar element is within the predetermined distance among the extracted bar elements;
determining whether or not the target bar element and the object bar element weld at least one same plate material;
determining whether or not the target bar element and the object bar element each weld the same plate materials when it is determined that the target bar element and the object bar element weld at least one same plate material; and
determining that the target bar element and the object bar element are the three-layer spot welded portion when it is determined that the target bar element and the object bar element do not each weld the same plate materials.

3. The analyzing method of the spot welded portion according to claim 2 , further comprising:
determining that the target bar element and the object bar element are a two-layer spot welded portion where two pieces of plate materials are stacked and spot welded and they each spot-weld different plate materials when it is determined that the target bar element and the object bar element do not weld at least one same plate material.

4. The analyzing method of the spot welded portion according to claim 2 , further comprising:
determining that the target bar element and the object bar element are the two-layer spot welded portion where two pieces of plate materials are stacked and spot welded and they each spot-weld the same plate materials when it is determined that the target bar element and the object bar element each weld the same plate materials.

5. The analyzing method of the spot welded portion according to claim 1 , further comprising:
changing the target bar element to be the extracted bar element when it is determined that there is not the bar element whose distance between the end point of the extracted bar elements and the end point of the target bar element is within the predetermined distance among the extracted bar elements.

6. The analyzing method of the spot welded portion according to claim 1 , further comprising:
calculating a distance from an end point of a target bar element which is targeted among the acquired bar elements to an end point of a shortest bar element existing on a common component with the target bar element as a distance between spots;
calculating a distance from the target bar element to a shortest edge as a distance between edges;
calculating a distance from the target bar element to a shortest edge line as a distance between edge lines; and
setting a minimum value among a value of the distance between spots, a value in which the distance between edges is doubled, and a value in which the distance between edge lines is doubled as an effective width B of the spot welded portion.

7. A non-transitory computer readable recording medium recording an analyzing program of a spot welded portion causing a computer to execute:
acquiring bar elements by which the spot welded portion to be analyzed is modeled;
extracting other bar elements existing at a periphery of a target bar element which is targeted among the acquired bar elements;
determining whether or not there is a bar element which shares the same end point with the target bar element among the extracted bar elements, by comparing an end point of the target bar element and an end point of the extracted bar elements;
determining that the target bar element and the bar element which shares the same end point with the target bar element are a three-layer spot welded portion where three pieces of plate materials are stacked and spot welded when it is determined that there is the bar element which shares the same end point with the target bar element; and
determining whether or not there is a bar element whose distance between the extracted bar elements and the target bar element is within a predetermined distance among the extracted bar elements when it is determined that there is not the bar element which shares the same end point with the target bar element, and determining that the target bar element and the extracted bar element are not the three-layer spot welded portion when it is determined that there is not the bar element within the predetermined distance,
wherein the distance between the extracted bar elements and the target bar element is a distance between the end point of the extracted bar element and the end point of the target bar element on a common plate material, and the predetermined distance is a thickness of the plate materials or a nugget diameter of the spot welded portion.

8. An analyzing apparatus of a spot welded portion, comprising:
processing circuitry configured to:
acquire bar elements by which the spot welded portion to be analyzed is modeled;
extract other bar elements existing at a periphery of a target bar element which is targeted among the acquired bar elements;
determine whether or not there is a bar element which shares the same end point with the target bar element among the extracted bar elements, by comparing an end point of the target bar element and an end point of the extracted bar elements; and
determine that the target bar element and the bar element which shares the same end point with the target bar element are a three-layer spot welded portion where three pieces of plate materials are stacked and spot welded when it is determined that there is the bar element which shares the same end point with the target bar element, and determine whether or not there is a bar element whose distance between the extracted bar elements and the target bar element is within a predetermined distance among the extracted bar ele

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Niwa Toshiyuki
• Hiwatashi Shunji
• Uenishi Akihiro
• Hirose Satoshi
• Kamada Yusuke
• Shirai Akira

Classifications

• G01M17/0078

  Shock-testing of vehicles · CPC title

• B23K31/12

  relating to investigating the properties, e.g. the weldability, of materials · CPC title

• G01N3/02 Primary

  Details · CPC title

• G06F30/15

  Vehicle, aircraft or watercraft design · CPC title

• G06F30/23 Primary

  using finite element methods [FEM] or finite difference methods [FDM] · CPC title