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TPJLR-52-360 Accelerated Environmental Ageing for Adhesives Used in Trim Applications

TPJLR-52-360  Accelerated Environmental Ageing for Adhesives Used in Trim Applications
TPJLR-52-360  Accelerated Environmental Ageing for Adhesives Used in Trim Applications

Adhesives Used in Trim Applications

A INDEX

A Index

B Scope

C Object

D Risk Assessment

E Review

F Related Documents

G Equipment

H Specimens

I Test Procedure

J In Service Temperature

K Application of Standards to Engineering Drawing

L Data Generated and Reporting

Z Change History

Appendix A In-service test temperatures for passenger vehicles

B SCOPE

This test procedure is applicable to all adhesives for use in interior or exterior trim applications.

C OBJECT

This test procedure is for assessing the effects caused by extremes of temperature and humidity on adhesives used to bond trim components. Any deviation from this procedure shall be by written agreement of the Materials Engineering Department and shall be stated in the report.

D RISK ASSESSMENT

A valid risk assessment must be in place before this test is conducted.

E REVIEW

This document must be reviewed at least every three years from the date of the last review or update.

Adhesives Used in Trim Applications

F RELATED DOCUMENTS

STJLR.51.5006

TPJLR.52.058

G EQUIPMENT

A suitable programmable environmental test chamber capable of reproducing the above

conditions and programmed to give the test schedule described in Section I.5 must be used. The heating and cooling rates shall be as fast as possible - minimum 1 °C/minute.

H SPECIMENS

1 Specimens shall be prepared as defined in the relevant Materials Standard. These can be: -

1.1 Peel Test samples prepared in accordance to TPJLR.5

2.058 for characterising the adhesive

in accordance to STJLR.51.5006.

1.2 Actual components as fitted to the vehicle, with relevant fixings etc. These are the required

samples for approval.

1.3 Actual components un-restrained. These can be used as an indicator prior to full assembly

testing

I TEST PROCEDURE

1 Position components in the vehicle attitude under physical restraints as near as possible to the

actual service conditions; whenever possible production parts such as screws, bezels, housings, sheet metal stampings etc shall be employed.

2 Peel Test Samples are to be positioned in the test chamber so that no surrounding component can

interfere with the samples during test.

3 Subject exterior components for thirty minutes minimum, one hour maximum to the highest

temperature achieved during ‘on wheels’ repair oven stoving. This temperature shall be 80 °C.

Exterior parts with in-service temperature greater than 80 °C and Interior components do not need to be subjected to the repair oven stoving.

4 Condition components/peel test samples at 23 °C ± 2 °C and 50% ± 5% RH for two hours prior to

subjecting them to 70 cycles of the environmental test schedule defined in clause I5.

Adhesives Used in Trim Applications

5 Test Schedule

The test cycle is detailed here and is shown graphically in figure 1 below.

5.1 Over a 2 hour period raise the temperature to 40 °C. At the point of raising the temperature to

40 °C immediately introduce 90 % RH into the chamber. The rate at which 90 % RH is

introduced will be defined by the maximum capability of the test chamber.

5.2 Dwell at 40 °C and 90 % RH for 4 hours

5.3 Over a 2 hour period, increase the temperature to T max while reducing the humidity to a

minimum whilst achieving a cross over temperature and humidity point of 55 °C and 55 % RH during the temperature ramp.

5.4 Dwell at T max with minimal humidity for 4 hours.

5.5 Over a 2 hour period reduce the temperature to 40 °C. At the point of reducing the

temperature to 40 °C immediately introduce 90 % RH into the chamber. The rate at which 90

% RH is introduced will be defined by the maximum capability of the test chamber.

5.6 At the point at which the test chamber stabilises at 40 °C this is considered to be the

completion of the first test cycle.

5.7 Dwell at 40 °C and 90 % RH for 4 hours

5.8 Over a 2 hour period, increase the temperature to T max while reducing the humidity to a

minimum whilst achieving a cross over temperature and humidity point of 55 °C and 55 % RH during the temperature ramp.

5.9 Dwell at T max with minimal humidity for 4 hours.

5.10 Over a 2 hour period reduce the temperature to 40 °C. At the point of reducing the

temperature to 40 °C immediately introduce 90 % RH into the chamber. The rate at which 90

% RH is introduced will be defined by the maximum capability of the test chamber.

5.11 Repeat steps 5.7 to 5.10 until 70 cycles have been completed.

Note: T max is defined by the in service temperature of the component application. See section J and Appendix A for T max.

Adhesives Used in Trim Applications

Figure 1 Graphical representation of the test cycle

6

Peel Test Samples

Perform 90° peel testing in accordance to TPJLR.52.058 as per the requirements of the relevant

materials standard or in accordance to the requirements agreed upon prior to test with JLR Materials Engineering.

J IN SERVICE TEMPERATURE

The temperature, which a component/material is required to withstand in service, depends on vehicle design, and component location. This shall be determined by the appropriate Materials and Engineering areas and defined on the engineering drawing in accordance with Section K. Typical temperatures are shown in Appendix A.

Minutes Temp °C Hum % RH

Adhesives Used in Trim Applications

K APPLICATION OF STANDARD TO ENGINEERING DRAWINGS

1 The drawing of the component shall be endorsed with the reference for this Standard followed by

the "in service" temperature, e.g. TPJLR.52.360/95 where the component is tested to 95 °C, as this is the advised maximum temperature to which it will be subjected in service.

2 The engineering drawing shall identify any allowable dimensional or other changes.

L DATA GENERATED AND REPORTING

1 There shall be no loss of adhesion, bridging, bubbling, curling, peeling, lifting or any form of

delamination in the adhesive joint on the test item after test.

2 On completion of the test, a test report must be created to include all of the data collected. This

can be included in a larger report that details more than one test, ensuring it has all of the data included.

3 The test report must be submitted to all interested parties and archived in accordance with current

corporate records retention policy.

Z CHANGE HISTORY

Adhesives Used in Trim Applications Appendix A In Service Temperatures for Passenger Vehicles

Adhesives Used in Trim Applications

Appendix A continued

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