KR102448236B1 - Method for testiing multi-material lightweight vehicle body parts - Google Patents

Abstract

The present invention relates to a test method for multi-material fusion lightweight body parts, which selects body parts that can be applied with lightweight metals and composite materials and analyzes their characteristics. Comparative analysis is carried out on the characteristics, especially the conditions of stiffness and weight reduction by making a comparative test specimen, and if it does not meet, a comparative test specimen is produced again and comparatively analyzed. This is to enable the establishment of a design guide for body parts to which the material is applied.

Description

Test method for multi-material fusion lightweight body parts {METHOD FOR TESTIING MULTI-MATERIAL LIGHTWEIGHT VEHICLE BODY PARTS}

The present invention relates to a vehicle body part, in particular, to a test method for a multi-material fusion lightweight body part in which steel and a lightweight metal or composite material other than steel are hybridized.

The automobile industry is continuously developing to meet the various tastes and needs of users. Among these developments, the rigidity of the vehicle body, which is closely related to the stability of the vehicle, is also being developed. That is, the body panel constituting the exterior of the vehicle is made of cold-rolled steel sheet having a certain rigidity, and when the vehicle is in operation or not in operation, a depression is generated in the vehicle body panel due to external force or other force, or minor or severe damage such as breakage is generated. Various problems can arise.

A stiffness test is being conducted on panels in various parts of the vehicle. When testing the rigidity of a body panel, the test in the state of the actual part is subject to various constraints, so it is better to conduct the stiffness test with a simplified test piece, calculate the optimal condition from the test result data, and then perform the final test with the actual part to which it is applied. It is common.

When body parts are manufactured from lightweight metals or composite materials, it is difficult to obtain accurate data on body part stiffness and passenger safety, as well as overall vehicle stiffness. In addition, when the unit of the part is large, it takes a lot of time and cost for the production of the developed part, especially when the shape of the part is complicated, there is a problem that it takes more.

Republic of Korea Patent Registration No. 10-0476203 (published on Mar. 16, 2005)

The present invention is based on the recognition of the prior art as described above, and when developing lightweight body parts, real parts are applied as they are to solve problems such as time delay and cost generation during testing and evaluation. We would like to provide a test method for

The problems to be solved in the present invention are not necessarily limited to the above-mentioned matters, and other problems not mentioned will be understood by the matters described below.

In order to achieve the above object, the test method for a multi-material fusion lightweight body part according to the present invention includes the steps of selecting a body part that can be applied with a lightweight metal and composite material (S100); analyzing the collision characteristics of the selected part (S110); selecting a section to be produced as a test piece from the selected part (S120); designing a test piece of the selected part (S130); manufacturing a steel test piece of the control group based on the test piece design of the previous step (S130) (S140); manufacturing a test piece of a comparison group to which a lightweight metal and a composite material is applied based on the design of the test piece of the previous step (S130) (S150); performing a stiffness test by pressing the test pieces of the control group and the comparative group with a pressure, and comparatively analyzing the obtained data (S160); In the comparative analysis data of the previous step (S160), determining the rigidity and weight reduction requirements, including whether the stiffness of the comparison group test piece compared to the control test piece is less than the equivalent level, and whether the weight reduction is less than or equal to the equivalent level (S170); In the determining step (S170), if the stiffness is less than the equivalent level or the weight reduction exceeds the equivalent level, analyzing and analyzing the comparative test specimen (S200); Based on the data analyzed and analyzed in the previous step (S200), the stiffness and weight reduction are re-determined by supplementing the stiffness or weight reduction, and if the data supplementing the stiffness or weight reduction matches the data, the test piece of the selected part is designed (S130). Proceeding (S210); If the data supplementing the stiffness or weight reduction does not match, reselecting the comparative test specimen and proceeding to the step (S110) of analyzing the characteristics of the selected body part (S220); In the determining step (S170), if the rigidity is equal to or higher than the equivalent level and the weight reduction is less than the equal level, establishing a guide for designing a body part to which the lightweight metal and composite material applied to the comparative group test piece are applied (S180); and completing preparation for development of the body part based on the established design guide for the body part ( S190 ).

In step S110 , the collision characteristics including the stiffness, the collision force, and the amount of pushing of the selected part may be analyzed.

In addition, it is possible to compare and analyze data of stiffness and weight reduction among data obtained from the test of the test pieces of the control group and the control group in step (S160).

In addition, if the stiffness is less than the equivalent level in step S210, the thickness of the comparative test specimen is increased by increasing the thickness of the test piece of the comparative group while the weight reduction is maintained at the equivalent level or less, and when the weight reduction exceeds the equivalent level, the thickness is decreased while maintaining the same level or more By making it thin, it is possible to reduce the weight to an equivalent level or less.

As described above, according to the present invention, there is an effect of establishing a design guide for a body part to which a light metal and composite material is applied by comparatively analyzing the steel test piece as the control group and the light metal and composite material test piece as the comparative group.

In addition, by comparing and analyzing the stiffness and weight reduction of the control test piece and the comparative group test piece, if the rigidity and light weight reduction conditions are not met, the comparative group test piece is re-produced and tested repeatedly. It has the effect of being able to manufacture body parts using lightweight metal and composite materials.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the present invention, so the present invention is limited only to the matters described in those drawings should not be construed as
1A and 1B are flowcharts illustrating a test method for a multi-material fusion lightweight body part according to a preferred embodiment of the present invention.
FIG. 2 is a view of selecting a body part to which a lightweight metal and a composite material can be applied among body parts in FIG. 1 and selecting a cross section for testing.
FIG. 3 is a view showing a test piece in which a cross section of the selected part is designed in FIG. 1 .
FIG. 4 is a view showing a comparative test piece made of a lightweight metal and a composite material in FIG. 1 .
FIG. 5 is a view showing a state in which a stiffness test is performed by applying a load to the test piece with the stiffness testing device in FIG. 1 .

Hereinafter, preferred embodiments will be described in detail so that those of ordinary skill in the art can easily practice the present invention with reference to the accompanying drawings. In addition, among the components mentioned in various embodiments, mutually similar components and related components in each embodiment may be replaced, replaced, or added. However, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention in describing the operating principle of the preferred embodiment of the present invention in detail, the detailed description thereof will be omitted.

A test method for a multi-material fusion lightweight body part according to a preferred embodiment of the present invention will be described in detail with reference to FIG. 1 .

Referring to FIG. 1 , first, a body part to which Kyungrang metal and composite material can be applied is selected ( S100 ). In this case, it is possible to select a body part capable of manufacturing a comparative test piece by applying a lightweight metal and a composite material from among actual body parts.

The characteristics of the selected body part are analyzed (S110). It is possible to analyze the collision characteristics, including the actual stiffness, collision force, and amount of sliding, of the body parts (hereinafter referred to as 'selected parts') selected as a comparison group test specimen to which light metal and composite materials are applied among body parts. .

Select a section to be produced as a test piece from the selected part (S120). As shown in FIG. 2, the cross section (line A-A) of the selected part to be manufactured as a test piece can be selected. At this time, the cross section may be one or several places depending on various conditions such as the center of the selected part, the region with the strongest or weakest rigidity, the region with the thinnest or thickest thickness, or the region most frequently applied during a collision. .

Design a test piece of the selected part (S130). As shown in FIG. 3 , a test piece of the cross-section selected from the selected part can be designed. At this time, based on the data on the collision characteristics obtained by testing the selected parts, the design for producing the test pieces of the control group and the comparison group can be proceeded.

A steel test piece is manufactured based on the design data of the test piece (S140). Based on the data obtained while designing the test piece, a test piece as a control can be manufactured with steel.

Based on the design data of the test piece, a test piece to which a lightweight metal and composite material is applied (S150). At this time, as shown in FIG. 4 , a test piece, which is a comparative group, may be manufactured using a lightweight metal and a composite material based on data obtained while designing the test piece.

Test specimens of the control group and the control group, respectively, and compare and analyze these data (S160), as shown in FIG. 5, the test specimen (S) of the control group, which is steel, on the pedestal 110 of the testing device 100 is pressed with a pressure 120 Therefore, it is possible to obtain relevant data by intensively testing the stiffness. In addition, if necessary, data on collision characteristics including stiffness, collision, and pushing amount can be obtained again. In addition, after the test of the control test piece, the comparative group test piece of light metal and composite material is placed, and the related data can be obtained by intensively testing the stiffness under the same conditions as the control test piece. Of course, if necessary, data on collision characteristics, including collision and pushing amount, can be obtained again. The data of the test piece of the control group and the test piece of the control group obtained in this way can be compared and evaluated.

The comparative evaluation data of the test piece of the control group and the test piece of the control group is determined (S170). At this time, if the rigidity of the test piece of the control group is equal to or higher than the equivalent level with respect to the test piece of the control group, and the weight reduction is less than the equal level, the next step (S180) may be performed. In addition, when the stiffness of the test piece of the control group is less than the equivalent level or the weight reduction exceeds the equivalent level with respect to the test piece of the control group, the step (S200) of analyzing and analyzing the test piece of the comparison group may proceed. Here, 'light weight' may be a degree of how light the self-weight of the comparative test specimen is than that of the control specimen.

As a result of the evaluation of the previous step (S170), if the stiffness of the test piece of the control group is less than the equivalent level or the weight reduction exceeds the equivalent level with respect to the test piece of the control group, the test piece of the control group is analyzed and interpreted (200). At this time, with respect to the stiffness and weight reduction of the comparative group test piece, how low the stiffness is for the control test piece, and how much the weight reduction is analyzed and analyzed.

Based on the analyzed and analyzed data, the stiffness or weight reduction is supplemented, and the stiffness and weight reduction are determined again (S210). At this time, if the stiffness of the test piece of the comparative group is less than the equivalent level, the stiffness can be increased by increasing the thickness while maintaining the weight reduction at the equivalent level or less. In addition, when the weight reduction exceeds the equivalent level, the thickness may be reduced while maintaining the rigidity at the equivalent level or higher to lower the weight reduction to the equivalent level or less. In addition, when the rigidity is less than the equivalent level and the weight reduction exceeds the equivalent level, the next step (S220) may be performed. As such, if the data supplementing stiffness and weight reduction match, the selected part may proceed to the test piece design step (S130), and if not, proceed to the next step (S220).

If the data supplementing stiffness and weight reduction do not match, the comparison group test piece is reselected (S220). If the data supplementing the stiffness and weight reduction in the previous step (S210) does not match, the comparison group test specimen is reselected, and the previous step returns to the step (S110) of analyzing the characteristics of the selected body part, and then the steps are sequentially performed. can

If the data match in the step of judging the comparatively evaluated data of the test piece of the control group and the test piece of the comparison group (S170), a design guide for the body part to which the lightweight metal and composite material of the test piece of the comparison group is applied is established (S180). At this time, if the evaluation data of the comparative group test piece has greater than or equal stiffness and equal or lower weight reduction, a guide for designing body parts based on the lightweight metal and composite material applied to the comparative test piece may be established.

Based on the established design guide of the body part, preparation for the development of the body part is completed ( S190 ). The light metal and composite material obtained in the previous step ( S180 ) may be applied to complete the preparation for the development of body parts based on the design guide that satisfies rigidity and weight reduction.

Having described the embodiments of the present invention above, these embodiments will be helpful in understanding various aspects and features of the present invention. Elements presented in these embodiments may be selectively combined with each other, and another embodiment that has not been described in this document may be presented by such a combination.

Hereinafter, claims for defining the scope of the present invention are described. The element(s) recited in the claims may be variously changed and modified and replaced with equivalents without departing from the spirit of the invention. Reference numerals in the claims, if any, are only intended to aid an easy and intuitive understanding of the claimed inventions or elements thereof, and do not limit the scope of the claimed inventions.

100: test device
110: pedestal 120: pressure.
S: A test piece.

Claims (2)

selecting a body part to which lightweight metal and composite material can be applied (S100);
analyzing the collision characteristics of the selected part (S110);
selecting a section to be produced as a test piece from the selected part (S120);
designing a test piece of the selected part (S130);
Based on the design of the test piece of the previous step (S130), manufacturing a steel test piece of the control (S140);
manufacturing a test piece of a comparison group to which a lightweight metal and a composite material is applied based on the design of the test piece of the previous step (S130) (S150);
performing a stiffness test by pressing the test pieces of the control group and the comparative group with a pressure, and comparatively analyzing the obtained data (S160);
In the comparative analysis data of the previous step (S160), determining the rigidity and weight reduction requirements, including whether the stiffness of the comparison group test piece compared to the control test piece is less than the equivalent level, and whether the weight reduction is less than or equal to the equivalent level (S170);
In the determining step (S170), if the stiffness is less than the equivalent level or the weight reduction exceeds the equivalent level, analyzing and analyzing the comparative test specimen (S200);
Based on the data analyzed and analyzed in the previous step (S200), the stiffness and weight reduction are re-determined by supplementing the stiffness or weight reduction, and if the data supplementing the stiffness or weight reduction matches the data, the test piece of the selected part is designed (S130). Proceeding (S210);
If the data supplementing the stiffness or weight reduction does not match, reselecting the comparative test specimen and proceeding to the step (S110) of analyzing the characteristics of the selected body part (S220);
In the determining step (S170), if the rigidity is equal to or higher than the equivalent level and the weight reduction is less than the equal level, establishing a guide for designing a body part to which the lightweight metal and composite material applied to the comparative group test piece are applied (S180); and
A test method for multi-material fusion lightweight body parts, comprising the step of completing (S190) preparation for development of body parts based on the established design guide for body parts. delete

Images