The phrase "affect the strength of" is correct and usable in written English.
You can use it when discussing how one factor influences or changes the intensity or power of another factor.
Example: "The amount of sunlight can significantly affect the strength of the plant's growth."
Alternatives: "influence the intensity of" or "impact the power of".
First, the redundancy of duplicated gene copies of similar function from different parents (homeologs) may affect the strength of selection.
The presence of vascular and obstetrical risk factors did not affect the strength of the association.
On Thursday evening, Poland's president, Andrzej Duda, and the Nato secretary general, Jens Stoltenberg, insisted that Brexit would not affect the strength of the alliance.
Various factors that significantly affect the strength of Brønsted acid sites in zeolites are discussed.
The results show that the installation conditions significantly affect the strength of the anchors.
Delamination is one of the most important material irregularities which affect the strength of materials under any type of loading.
Based on fundamental technological investigations the parameters which specifically affect the strength of the joints were identified and analyzed.
Nevertheless, since Nisipeanu is currently rated above Khalifman this didn't affect the strength of a very powerful event which contained (in current rating order) Veselin Topalov, Polgar herself, Ruslan Ponomariov, Rustam Kasimdzhanov, Anatoly Karpov and Nisipeanu.
Donald Trump's election as US president could affect the strength of the Anzus treaty and Australia's relationships in the Asia-Pacific region, former federal foreign minister and NSW premier Bob Carr has warned.
All aggregate materials must be clean and free from admixture with soft particles or vegetable matter, because even small quantities of organic soil compounds result in chemical reactions that seriously affect the strength of the concrete.
