diff --git a/02_Presentation/validationAndConvergence/dynamics/structuralDynamics.md b/02_Presentation/validationAndConvergence/dynamics/structuralDynamics.md
index 40ef586259a1cbb185083231846117e6945f0bba..6775d1e0b1c610e2bbfba3812cc73aa818b1e7a9 100644
--- a/02_Presentation/validationAndConvergence/dynamics/structuralDynamics.md
+++ b/02_Presentation/validationAndConvergence/dynamics/structuralDynamics.md
@@ -68,13 +68,13 @@ det[[K]-\omega^2[M]]=0 \\
 (Red horizontal lines are the FEM frequencies calculated in the last sections, blue lines are the fft of the x displacement of the final node).
 
 - 40 Elements:<br></br>
-<img src="./40.PNG" width=50%><br></br>
+<img src="./40.png" width=50%><br></br>
 - 10 Elements:<br></br>
-<img src="./10.PNG" width=50%><br></br>
+<img src="./10.png" width=50%><br></br>
 - 5 Elements:<br></br>
-<img src="./5.PNG" width=50%><br></br>
+<img src="./5.png" width=50%><br></br>
 - 1 Element:<br></br>
-<img src="./1.PNG" width=50%><br></br>
+<img src="./1.png" width=50%><br></br>
 
 
 
@@ -84,9 +84,9 @@ Applying Critical damping (=1.0, local relative damping) does not seem to have a
 Global Damping has a major effect on the results:
 
 - 40 Elements without global damping:<br></br>
-<img src="./40Dis.PNG" width=50%><br></br>
+<img src="./40Dis.png" width=50%><br></br>
 - 40 Elements with 0.0001 global damping:<br></br>
-<img src="./40DisDamp.PNG" width=50%><br></br>
+<img src="./40DisDamp.png" width=50%><br></br>
 - Natural Frequency:<br></br>
 <img src="./40Damp.png" width=50%><br></br>