Also note: Blunt trauma:
If you take a hit to the chest, even with full plate armour from an axe, a sword, anything. You get hurt. The armour stops it from tearing your flesh, but even with padding a direct and clear hit will break bones, crush muscles, and so on due to blunt trauma. Throw jelly pudding in a palstic box against the wall. Even when the plastic box survives (=your armour) your pudding will be squashed. Now, the same is true for your inside when something hits your amazing steel chestplate with enough force.
PS: I have read a lot about medieval projectiles VS armour, and have conculded the following:
Piercing armour with projectiles
They are in general poor against any form of armour from long ranges, but are still very effective due to blunt trauma, fear factor, and in 99% of the cases armour never covered all of the body. Thereby, an arrow to your leg stops you just as good as one to your hearth, it only doesn't pose such a lethal threat. Then again, if it penetrates armour it's often pretty bad. I've read a lot into this peculiar subject, and there are examples of both extremes:
Roman mailed cavalry shrugging off rains of arrows.
A mail armoured crusader king or commander that took an arrow into his armpit and penetrated straight through his chest, with the point protruding from the other armpit.
Being far stronger but using heavier projectiles, they are better at penetrating armours, but have a lower arc when flying and alsoa shorter range. They are easy to wield, yet large and cumbersome, which will only get worse the stronger it gets. Forget about your AC wrist-mounted crossbow penetrating mail armour already, if you plan on reloading it with 1 hand only that is.
I'm not 100% sure on this one, but I read in books that Milanese armoursmiths (those who crafted full plate armours) always tested every armour by firing a crossbow bolt into them from point-blank range as a testing standard. If it penetrated, it was not good enough. (blunt traume would cause harm though)
Thrown daggers DO NOT HURT ARMOUR. They're far too light to cause any serious form of blunt trauma, and they're useless against armour. Better keep the dagger and stab him in the weakspots.
Javelins and thrown axes: I don't know much about those.