## 2 Experimental Programme
### Sustained Loading Experimental Series  
The details of each experimental series are listed in Table 2, i.e., where the cycle function (steady for constant objective temperature and cyclic for 24 h-periodical temperature cycles), whether the specimens were preconditioned (or not) before loading, the objective temperature in the climate chamber, the temperature measured on the specimen's surface, the temperature measured inside the NSM groove (attached to the CFRP) and the duration of the test are presented.  
In the experimental series S1 (previously presented in [PERSON] et al. [11]) and S2, specimens were tested under steady temperatures, while in series S3 and S4, trapezoidal and triangular 24-h temperature cycles, respectively, were applied (Figure 3). Experimental series S3 was split into two different steps. First, specimens were subjected to an objective temperature cycle ranging between 18.0 and 38.0 \({}^{\circ}\)C (S3-A) and then, after 600 h of testing and without any unloading, the same specimens were subjected to a new objective temperature cycle ranging between 22.0 and 43.0 \({}^{\circ}\)C (S3-B). Series S1-S3 were subjected to a thermal preconditioning before loading which consisted of acclimatizing the specimens to the objective temperature for seven days. In series S4, the specimens were loaded without undergoing any previous preconditioning stage.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Series** & \begin{tabular}{c} **Temperature** \\ **Function [24 h]** \\ \end{tabular} & **Preconditioning** & \begin{tabular}{c} **Objective T\({}^{\circ}\)C** \\ **[\({}^{\circ}\)C]** \\ \end{tabular} & \begin{tabular}{c} **T\({}^{\circ}\)C on the Specim’s** \\ **Surface [\({}^{\circ}\)C]** \\ \end{tabular} & \
\begin{tabular}{c} **T\({}^{\circ}\)C in the NSM** \\ **[hours]** \\ \end{tabular} &
\begin{tabular}{c} **Test Duration** \\ **[hours]** \\ \end{tabular} \\ \hline S1 & Steady & Yes & 20.0 & 19.9 & 18.7 & 1000 \\ S2 & Steady & Yes & 40.0 & 40.1 & 37.7 & 1000 \\ S3-A & Cycles 24 h & Yes & 18.0–38.0 (28.0) 1 & 18.0–36.9 (26.9) 1 & 17.8–33.9 (25.6) 1 & 600 \\ S3-B & Cycles 24 h & Yes 2 & 22.0–43.0 (32.5) 1 & 23.0–43.0 (33.7) 1 & 24.6–39.2 (31.3) 1 & 1000 \\ S4 & Cycles 24 h & No & 20.0–40.0 (30.0) 1 & 19.6–39.5 (30.1) 1 & 21.9–31.9 (26.8) 1 & 1000 \\ \hline \hline \end{tabular}  
* Mean temperature indicated in brackets; 2 Preconditioning consisted of the temperature regime of the previous experimental series (S3-A).  
\end{table}
Table 2: Details of experimental series.  
Figure 3: Temperature in the experimental series: **(a)** S1; **(b)** S2; **(c)** S3-A; **(d)** S3-B; **(e)** S4.  
Figure 3 shows the details of the objective temperature (red curve), the temperature on the specimen's surface (blue curve) and the temperature inside the NSM groove (black curve) for all series. As observed, the temperature on the specimen's surface was generally lower than the objective temperature for both steady and cyclic temperature series, basically due to thermal inertia effects. Furthermore, in the cyclic temperature series, the mean temperature measured inside the NSM groove was between 1.3 and 3.3 \({}^{\circ}\)C lower than on the specimen's surface, while in the steady temperature cycles this difference did not occur. Finally, in the S3 series, with a trapezoidal shape for the objective temperature, the temperature inside the NSM groove reached higher values than in the S4 series where a triangular shape was programmed as the objective temperature.