# 7.1 Troubleshooting: Failure Modes

> From: LOCTITE®X Digital Manual for Bonding (https://www.loctitex.com/en/manuals/bonding/7.1-troubleshooting-failure-modes/)

### 7.1 Troubleshooting: Failure Modes

There are four different types of assembly failure modes: adhesive, cohesive, substrate and adhesive/cohesive. When analysing a failed assembly, it is essential to determine which failure mode has occurred. A thorough understanding of these failure modes will help identify the root cause of the failure, as well as contributing factors.

_Figure 207 Examples of the different failure modes_

![Figure 207 Examples of the different failure modes](/en/manuals/bonding/assets/img/adhesive-substrate-failure-mode-cohesive.jpg)

![Figure 207 Examples of the different failure modes](/en/manuals/bonding/assets/img/adhesive-substrate-failure-mode-cohesive-adhesive.jpg)

![Figure 207 Examples of the different failure modes](/en/manuals/bonding/assets/img/adhesive-substrate-failure-mode-adhesive.jpg)

![Figure 207 Examples of the different failure modes](/en/manuals/bonding/assets/img/adhesive-substrate-failure-mode-substrate.jpg)